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Location: http://www.cs.mun.ca/~ulf/gloss/cats.html. By Ulf Schünemann since 2002. Please mail any comments.

Categories

  1. What There Is:
    - dichotomy 1: physical/concrete/substantial <-> conceptual/abstract/formal
    - dichotomy 2: particular/instance <-> general/universal/type
    - dichotomy 3: urelement (non-set) <-> set (extension of universal)
  2. Classification of Properties
  3. Interaction of Dichotomies
  4. Mixed Categories
  5. Relations, Roles, Contexts
  6. States and Events
[AlgSem] Godehard Link: Algebraic semantics for natural language: some philosophy, some applications; 765-784: Int J Human-Computer Studies 43; 1995.
[FO] Nicola Guarino: Formal ontology, conceptual analysis and knowledge representation; 625-640: Int J Human-Computer Studies 43; 1995.
[FOCS] Barry Smith: Formal Ontology, Common-Sense and Cognitive Science. 641-668: Int J Human-Computer Studies 43; 1995.
[GOF/CM] Giancarlo Guizzardi, Heinrich Herre, Gerd Wagner: On the General Ontological Foundations of Conceptual Modeling; TR?, 2002?.
[KRCR] Nino B Cocchiarella: Knowledge representation in conceptual realism; 697-721: Int J Human-Computer Studies 43; 1995.
[OntDom] Johannes Dölling: Ontological domains, semantic sorts and systematic ambiguity; 785-807: Int J Human-Computer Studies 43; 1995.
[OntMeta] Nicola Guarino, Massimiliano Carrara, Pierdaniele Giaretta: An Ontology of Meta-Level Categories; in: "KR'94: Principles of Knowledge Representation and Reasoning" Morgan Kaufmann 1994.
[OntPrinc] Nicola Guarino: Some Ontological Principles for Designing Upper Level Lexical Resources; Proc. of the First International Conference on Lexical Resources and Evaluation, Granada, Spain, 2830 May 1998.
(similar: Avoiding IS-A Overloading, and The Role of Identity Conditions in Ontology Design; LNCS 1661; 1999)
[OntTax] Nicola Guarino, Christopher Welty: Ontological Analysis of Taxonomic Relationships; International Conference on Conceptual Modeling / the Entity Relationship Approach; 2000.
(preliminary version?)
[OOO] Brian Cantwell Smith: On the Origin of Objects; a Bradford Book, MIT Press 1996. [TOC] John F Sowa: Top-level ontological categories; 669-685: Int J Human-Computer Studies 43; 1995.

«The first step in designing a database, a knowledge base, or an object- oriented system is to select an appropriate collection of ontological categories. In database theory, the categories are usually called domains; in AI, they are called types; in O-O systems they are called classes; and in predicate calculus they are called sorts. Whatever they are called, the selection of categories determines everything that can be represented in a computer application or an entire family of applications. Any incompleteness, distortions, or restrictions on the framework of categories must inevitably limit the flexibility and generality of every program and database that uses those categories» [TOC 670].

«The richest source of ontological categories is the vocabulary of natural languages» [TOC 671]. And «philosophers have spent 25 centuries devising, analysing, and debating ... categories» [TOC 673].

What There Is

Dichotomy 1: Physical/Concrete/Substantial <-> Conceptual/Abstract/Formal

«The ... distinction between tangible [physical] objects and processes and the intangible [abstract] structures of mathematics is one of the oldest distinctions in the history of philosophy» [TOC 673]. While the being of concrete physical objects is spatio-temporal, the being of abstract mathematical entities is eternal, non-spatial [x]. Things located in space and/or time are said to "exist", whereas things outside of space and time "subsist". «For example, individual things exist; the relation of equality between property instances, on the other hand, subsists» [x]. (cf. the substance:accident modes of being)

«The ordinary language expression `there are' is ambiguous, as it designates two different concepts: the logical concept something and the ontological concept of existence. Logic takes care of the former, analyzing it as the existential quantifier, which it might be better to rechristen particularizer, or indefinite quantifier .... Surely most contemporary philosphers hold that formalizes both the logical concept "some"and the ontological concept of existence. Consider the statement "Some sirens are beautiful", which can be symbolized "(x)(Sx & Bx)". So far so good. The trouble start when the formula is read "There are beautiful sirens". The existential interpretation is misleading because it suggests belief in the real existence of sirens, while all we inteded to say was "Some of the sirens existing in Greek mythology are beautiful"» [MB3 155].

  1. Physical/Concrete World, or Reality. «[T]he world is constituted by things only. But things change and, as Aristotlesaw, if a change occurs then it was possible to being with. ... Possibility, then, is inherent in reality because reality is changing. ... Real possibility will then be admitted as an ontological category not to be confused with either conceptual possibility or uncertainty» [MB3 164f].
    1. Actuality (laws and circumstances)
      1. The Presence (existence). There are objects which do exist (now) [KRCR].
      2. Rest of actuality (being). «[T]here are objects that do not (at present) exist, but which either did exist or will exist, and in that regard such objects have being even if they do not (now) also have existence» [KRCR].
    2. Real or de-re possibility (lawfulness)
      - Chrysippus (Stoic) "that which is not prevented by anything from happening even if it doesnot happen" [MB3 172].
      - Bolzano (1821): "physical possible is that which does not contradict any of the so called laws of nature" [MB3 173].
      «There are ... objects that are merely possible in nature (such as the oak tree that an acorn could have grown into before that acorn was crushed underfoot)--i.e. objects that could have existed in nature, did in fact never will exist at all (in our space-time universe).» [KRCR]
      «In fact every scitific activity of the theoretical kind deals not only with actual facts but also with real possibilities» [MB3 177]. Eg. theoretical mechanics (all possible motions of all possible bodies, as opposed to experimental and applied mechanics); theoretical chemistry (all possible chemical compounds) ... «In other words all theoretical science utilizes the concept of a possible thing and even that of a possible stateof a possible thing ... But of course the notion of a possible individual of this kind is not characterized with the help of modal logic or model theory - let alon with that of any system of possibleworlds metaphysics. In theoretical factual science a possible thing, such as a possible compound or a possible organism or a possible community, is an arbitrary member of the class of hypothetical referents of the theory of interest - i.e. an individual possessing ("obeying", "satisfying") the law statements of the theory. On the other hand the notion of a possible world (nowadays often identified with that of a model of an abstract theory) is alien to factual science: we have access to no substantial world other than the real world» [MB3 177].

  2. The abstract / conceptual world (subsistance). «And then there are also abstract objects, i.e. object that because of their abstract nature cannot exist (in the space-time manifold of any causually possible world), but which nevertheless have being as objects (i.e. as values of bound individual variables)--which is why we say there are such objects. Indeed, we can even say in indirect forms of speech that such objects "exist"--as when we say that someone believes that Pegasus exists, or when we say of fictional characters that they "exist" in the abstract world of a certain story. But this sort of abstract "existence" is not the same as the existence in a concrete possible world--because it is only as constitutents of propositions ... that abstract objects can be said to exist ... Propositions ... make up the abstract world of our theories, stories, beliefs, etc., which unlike the concrete worlds made up of events and states of affairs, are usually incomplete, and in some cases even inconsistent.» [KRCR]

    Bunge's conceptual categories

    «We feign that there are constructs, ie. creations of the human mind to be distinguished not only from things (eg. words) but also from individual brain processes. (Only, we do not assume that constructs exist independently of brain processes.) ...» [MB3 116].
    Construct
    [MB3 117]
    Concept
    «Concepts, such as the notion of a thing, are the building blocks of propositions - such as 'All things change'» [MB3 116]
    Individual
    Set
    Relation
  3. propositional function/predicate/attribute: Individual* -> Proposition
  4. other functions: numerical ...
  5. non-functional relations
  6. Proposition = value of propositional function/predicate/attribute
    Propositions are «constituents of contexts - such as the set of all propositions concerning dogs - and of theories» [MB3 116]
    Context (closed context = theory)
A common ontology for concrete and abstract objects? «To us the basic dichotomy in any set of objects is not that between individuals and sets but that between physical objects and conceptual ones» [MB3 52]. «[U]nlike Lesniewski and his fellow nominalists, we draw a radical distinction between physical and conceptual individuals and reject the thesis that a single theory [of wholes and parts] should be able to account for both kinds of individuals» [MB3 50]. «The totality of objects has no property other than that of being the union of the class of [physical] things and that of [abstract] constructs. Therefore ontology cannot be construed as the theory of the arbitrary object, or of all objects: there is nothing to be said about O beyond what has just been said. This does not preclude the possibility of making long discourses about the ability to think of all objects, for when so doing we employ binary predicates such as "representing" or "thinking of", which are not subject to the above restriction» [MB3 118].

[MB3 54] «Finally a word or two about substantial existence as distinct from existence in general. The existence of simple individuals can be ascertained only by scanning the entire set S [of concrete objects]. If a belongs to S and is not the null individual we say that a exists. That is, we explicate "a exists" as "a != U & aS". This concept of existence can be called bare substantial existence. It suffices in the theory of substance, where the only individuating property is composition. ... Note that this is a notion of ontic or physical existence to be distinguished from that of conceptual existence. In formal science to say that an individual a exists it suffices to assume or to prove that a belongs to some set that has been satisfactorily characterized. In ontology we have no use for arbitrary sets except perhaps as auxiliaries devoid of ontological import: here to exist (substantially, physically) is to have a number of substantial properties, among them that of associating with other nonceptual objects.»

Dichotomy 2: Particular/Instance <-> General/Universal/Type

The other common top-most dichotomy is that between particulars and universals. Besides particular objects, qualities, relations, events, etc. one can also consider types of objects, qualities, relations, events, etc. which are somehow similar. For instance, the type of red objects, of tables, of trees, of individual rednesses, of familiar relations, or of annual events [x].
See the ontological status of types/universals
The minimal top-level categories of of a modern particular:universal-based ontology [OntPrinc] (cf also [Parts] on continuants & occurants):
Particular Location SPACE a region of absolute space
TIME an interval of absolute time
Object Concrete
Object
CONTINUANT have a location in space, which may vary over time; their parts are continuants, not occurants.
(eg, an apple)
OCCURANT are "generated" by the behavior of continuants over time; they rigidly depend on the continuants which take part in them; have a unique temporal location, spatial location is bound to that of the partaking continuants; their parts are occurants, not continuants.
(eg, the fall of an apple)
ABSTRACT OBJECThave no location in space nor time
(eg, Pythagora's theorem)
Universal Property CATEGORY [+rigid, -IC], carries no identity criteria (IC)
(eg, location, object, event[dependent])
TYPE [+rigid, +IC]
(eg, person[+independent])
  1. TYPE: supplies identity criteria (IC)
  2. QUASI-TYPE: carries IC inherited from a subsuming type [OntTax]
ROLE [-rigid, -independent]
  1. MATERIAL ROLE: carries IC inherited from a subsuming type (eg, student)
  2. FORMAL ROLE: no identity criteria (eg, patient, part)
ATTRIBUTION[-rigid, +independent, -IC]
(eg, red, decomposable - NB: not color)
RELATION
-> subclassification of relations
(eg, part-of)
the terms 'IC', 'rigid' and 'dependent' characterizing the subcategories of Property are in part explained in t.w.o.

Dichotomy 3: Urelement (non-set) <-> Set (extension of universal)

The categories of GOL (General Ontological Language) [GOF/CM]
But where are the abstract/conceptual objects in the GOL ontology?
- Note that the urelement:set dichotomy is not meaningful for them: «Whether an object is an individual or a set is of interest to ontology: if the former then it may be either physical or conceptual, if a set it can only be a concept. But whether a conceptual object (a construct) is an individual or a set is metaphysically and even mathematically irrelevant. This is for the following reasons. First, what is a (conceptual) individual in one theoretical context may become a set in another and conversely: it all depends on the fineness of our analysis. Second, some set theories draw hardly any distinction between sets and individuals» [MB3 52].
«To us the basic dichotomy in any set of objects is not that between individuals and sets but that between physical objects and conceptual ones.» [>]

Entity Urelement Individual (instance of 0..1 universals)
  • 3D-individuals: substances, qualities, forms, roles, functions ...
  • 4D-individuals: processes, aggregates of processes, temporal boundaries of processes ...
  • Chronoid (instance of Time universal)
    Topoid (instance of Space universal)
    Substance (bears >0 moments [inherence relation])
  • existentially independent from other individuals
  • founded on matter formed in a certain way
  • has a chronoid as lifetime
  • eg. the moon, my car, an individual person
  • Moment (existentially dependent on substances [inherence relation])
  • eg. an electrical charge
  • has a chronoid as lifetime, included in the bearing substances' lifetimes
  • Quality (one-place moment)
  • existially dependent on 1 substance
  • eg. a color, a temperature
  • Relational Moment (instance of relational universal)
  • existially dependent on >1 substances
  • eg. a flight connection, a purchase order
  • Universal (with >0 individuals as `instances', and 1 extension-set) Quality Universal (with qualities as `instances')
  • eg. Color, Weight
  • Relational Universal (with relational moments as `instances')
  • eg. Flight-connection, Purchase
  • ... Time (chronoids as instances), Space (topoids as instances) ...
    Set (with entities as `members') Extension (of >0 universals) Extensional Relation (extension of >0 relation universals)
    ...
    ...
    relations:

  • formal relation - holds directly without mediating individuals. Eg. 5 isGreaterThan 4, this day isPartOf thisM month, N isSubsetOf Q ... Either it is an extensional relation (ie. a set), or it is "given by" a relation universal (having an intension and an extension). If R is a formal relation and [a,b] : R then <R : a, b> is called formal fact.
  • material relations - mediated by an individual called relator. Eg. a flight connection NA435 relates two airports Paris and Berlin. Then <NA345: Paris, Berlin> is an individual called material fact. Its duration depends on the liftetime of r.
  • relator universal - has relators as instances

    Classification of Properties

    1. Dichotomic/Boolean vs. Other Properties

    «Every individual property, or property of a particular, is dichotomic in the sense that the individual either has it or fails to possess it» [MB3 63].

    2. Simple vs. Complex Properties

    The conjunction P /\ Q of property-denoting predicates P and Q denotes the complex property composed of P and Q. «Properties ... may be simple (or basic) or complex (or derivative). For example in contemporary physics mass, charge, spin and strangeness are regarded as basic (simple) properties in the sense that they are nor reducible to any other properties. On the other hand weight is a derivative (complex) property, as it consists in an entity's having a mass and being placed in a gravitational field. That is, weight is the conjunction of two properties. ...
    It seems reasonable to assume that, even though we often find it difficult if not impossible to ascertain whether a given property is basic, reality has no such problem and builds complex properties ... out of simpler ones» [MB3 83].

    3. Unary/Intrinsic vs. Relational/Mutual Properties

    1. Unary or intrinsic properties «Some properties, such as radioactivity and intelligence, are inherent properties of individuals. Therefore we can sometimes represent them by unary attributes:
      Rad: Atoms -> Propositions involving Rad
      Int: People -> Propositions involving Int» [MB3 65]
    2. Relational or mutual properties «Other properties, such as solubility and performance, are properties of pairs or, in general, n-tuples of substantial individuals. Accordingly we represent them by predicates of rank 2 or higher, such as
      Sol: Solutes × Solvents -> Propositions involving Sol
      Per: People × Circumstances -> Propositions involving Per» [MB3 65]
    «[S]ome n-ary predicates, with n>1, represent intrinsic properties. For example, the gross national product, which is an intrinsic property, is representable by a predicate of the form
    GNP: N × T × U × Q+ -> Propositions involving GNP,
    where N is the family of nations, T the set of years, U the set of units of production (e.g. dollars), and Q+ the set of positive fractions» [MB3 65].

    Frame- and environment-dependent mutual properties. «A mutual or relational property of an entity may or may not depend causally upon some other individual. For example velocity is a mutual property since it depends on both the moving entity and the reference frame, but it is not caused by the latter. The same holds for distance, duration, frequency, mass, temperature ...: they are frame-dependent but not causally dependent upon the reference frame, which is assumed to be passive. On the other hand certain mutual properties are environment-dependent. This is the case with the force on a body, ... solubility, ... the performance of a student ...: in all these cases the environment excerts an influence on the entity of interest. All the phenomenal properties, such as color and perceived loudness, are mutual properties of this kind, i.e. they depend not only upon the object-in-the-environment but also upon the subject or perceiver» [MB3 66].
    «[I]t might be thought that, since all relations can be reduced to binary relations (Quine, 1954), the n-arity of a predicate is unimportant. This may well be so, but such a logical reduction need not be construed as mirroring anything in reality. Our planet does not cease to revolve around the Sun between Mercury and Saturn at the moment ternary relations were shown to be reducible» [MB3 69].

    Unarized dichotomic/Boolean properties. «Fortunately we can introduce a remarkable uniformity, and thus pave the way for the search for structure, by [replacing] every mutual property by a bunch of intrinsic properties. ... Consider the property of falling. ... In science, this is analyzed as a binary predicate F such that `Fxy' is interpreted as "x falls on y". We can now freeze the second argument, i.e. take it forgranted that whatever falls does so on a fixed body b such as our planet. That is, we can form the pseudo-unary predicate Fb such that

    Fbx = x falls on b.
    If we change the value of the parameter, say to c!=b, we obtain another predicate, namely Fc ... In this way the single binary predicate F is replaced by an infinite set of unary predicates Fz. ... There is of course no economyat all in the unarization procedure: this is just a trick allowing one to speak, although at greater length, of any property of an individual as if it were intrinsic. Therefore it has nothing to do with Bradley's attempt to eliminate relations in favor of monadic predicates or "internal relations" (Bradley, 1893)» [MB3 70].
    «Every one of [the unarized predicates] may be taken to represent an intrinsic property and moreover an individual [ie. dichotomic/Boolean] one, for it is either possessed or not possessed by the corresponding substantial individual» [MB3 71].

    4. Resultant and Emergent Properties

    «Let Pp(x) be a property of an entity xS with composition C(x) [SUPER] {x}. The P is a resultant or hereditary property of x iff P is aproperty of some components yC(x) of x other than x; othewise P is an emergent or gestalt property of x» [MB3 97].

    Interaction of Dichotomies

    «Substance and form, individual and universal, are distinct aspects of our conceptual analysis and theoretical modelling of things and facts. Lacking an independent existence, they are not mutually reducible. That is, universals are not collections of particulars (nominalist reduction) and particulars are not bundles of universals ("realist" reduction)» [MB3 107].

    1. Properties can be particular/individual, not only universal

    One may talk of, e.g., "the paleness of Socrates", as opposed to the paleness of everybody else. However, ontological economy may speak to eliminating such individual properties [
    x]. Understood as an abstraction from individual properties, the same quality may be possessed by more than one object (in a very different way from the common possession of a subtantial thing, like a yacht) [x].

    Cf. Phenomenology: «Phenomenology distinguishes sharply between perceptual properties on the one hand, and abstract properties on the other. Consider two white billiard balls, called A and B. The white colour of A, which one can see with one's eyes, is said to be located in space where A is. The white colour of B, similarly, is taken to be located where B is. Furthermore, it is maintained that the colour of A is not identical with the colour of B, since they are located at two different places. The same shade of colour, according to this analysis, divides into as many 'colour instances' of that shade as there are individual things with this colour shade.
    However, all of these instances are instances of the same colour shade. There exists, therefore, according to phenomenology, also the abstract colour shade of which the instances are instances. Let us call this abstract colour the 'universal whiteness'. Phenomenology asserts that there is not only a direct perception of instances of whiteness, but also a sort of direct perception of the universal whiteness. This perception is called 'eidetic intuition'. By means of eidetic intuition we have knowledge of the essential features of the world. Phenomenologists call such universals essences.» [x]

               health  .--------------------.
               model   |     .------v       |  care
        Person---------|  Well      Sick<---|--------Doctor
          ^            |   A ^------' A     |          ^
          :            `---|----------|-----'          :
          :                |          |                :
          : «instance»     |          |                : «instance»
          :                |          |                :
          :    health  .---|----------|-----.          :
          :    model   |   | .------v |     |          :
        John-----------| JohnWell  JohnSick |          :
                       |     ^------'   ^   |          :
                       `----------------:---'          :
                                        :              :
                             «instance» :              :
                                        :      care    :
                                  JohnSick#23<-------Susan
    
    Individual states in object-oriented modeling have been proposed by Bock [Conrad Bock: A More Object-oriented State Machine; JOOP Jan 2000]. He describes an object-oriented model of Persons whose health state is modeled as a state machine were states Well and Sick can alternate. In the Sick state only, the Person is taken care of by a Doctor. On the instance, an individual Person like John has a corresponding individual instance of the state model with its individual states JohnWell and JohnSick/ JohnWell and JohnSick are considered state types (classes) which are specializations of Well and Sick. An instance of state JohnSick is, e.g., the 23rd time when John was in state JohnSick. In that state instance JohnSick#23, John was/is taken care of by Doctor Susan.

    2. Properties/universals can be substantial, or formal

    navigation bar: Universals (properties, attributes, features, forms, types)
    object
    = universals (shared)
    + X (unshared)
    concrete obj.: properties
    <-> concept: attributes
    individual: properties
    <-> particular: features
    properties
    <-> classes
    ontological status of universals attributes = properties?
     
    «All object have properties. If the objects are conceptual or formal, their properties will be called formal properties, or attributes or predicates for short. If the objects are substantial individuals, their properties will be called substantial properties, or properties for short» [MB3 58].
    P is a substantial property, PProp, iff some substantial individuals possess P, ie., (Ex)(xS & x possesses P) [MB3 71].
    1. Property PProp is a (substantial) universal in a set TS of entities iff P's scope S(P) = T. (cf. scope)
    2. Attribute AAttr is a (conceptual) universal in a set TC of constructs iff A's extension E(A) = T. [MB3 105]
    Substantial properties are in re, while conceptual universals (predicates) are entita rationis (post rem is represeting substantial universals preexsting knowledge, or ante rem if anticipating experience). -> ontological status of universals

    Concrete objects have no (unary) formal/conceptual properties (hence mathematics cannot illucidate them): «[C]oncrete objects (things) have no intrinsic [ie. unary] conceptual properties, in particular no mathematical features. ... What is true is that some of our ideas about the world, when detached from their factual reference, can be dealt with by mathematics. ... not the world but some of our ideas about the world are mathematical.» [MB3 118f].
    «[T]he so called formal properties of things, such as number and shape, appear to be full fledged conceptual universals inherent in concrete entities and thus defy the substantial/conceptual dichotomy ... Thus numerosity is a property of any collection whatever the nature of its components. True, but then a set is a concept. Surely dogs are normally four legged, this being a substantial property of theirs. The corresponding mathematical property is the cardinality of the set of legs of a dog. On other words four leggedness is a substantial property to be distinguished from the mathematical property of the set of legs of a quadruped» [MB3 106].

    Conceptual objects represent concrete objects. «The relation between the predicate and the corresponding property is that of representation: the former represents the latter ... [N]ot things but our models of them have mathematical properties, and this because we conceptualize substantial properties as functions. This mode of representation is so deeply ingrained in our habits of thought that we often mistake the deputy for his constituency» [MB3 106].
    «Intrinsic [ie. unary] properties are either of [physical] things or of [abstract] constructs. One the other hand a mutal [ie. relations] (e.g. binary) property can link things with constructs. An example of a mutual property of this kind is that of representation, such as it occurs in the statement `Proposition p represents thing b'» [MB3 118].
    -> continue quote: A concept (with attributes) represents a substantial individual (with properties).
    -> substantial properties must be representable by propositional functions

    3. Aggregates =/= Sets

    navigation bar: Wholes and Parthood
    wholes & system composition levels part-whole relations
    different kinds of parthood and compositeness
    aggregates (concrete)
    =/= sets (conceptual)
    ontological status of wholes vs. parts
    holism, atomism (allied with reductionism), systemism
     
    [MB3 52, where we replace Bunge's sign for the universe to `U'] «While the null individual, a concept, is (indentical with) [], the world (or reality) is said to be denoted by the symbol `U'. In our theories of substance the world is an individual but not just one more individual: it is the entity that contains as components all other entities. But this is as far as our theories of substance go: they give no details about the structure of U. On the other hand they do assign definite structures (semilattice in one case, lattice in the other) to the furniture of the world, i.e. S.
    We emphasize that S, the set of all entities, is not the same as the aggregate or whole [S] composed of all physical objects. The difference between the concept S and the entity denoted by [S] = U illustrates the construct/thing dichotomy. To us the basic dichotomy in any set of objects is not that between individuals and sets but that between physical objects and conceptual ones. That is, we assume that every class O of objects is split into a class C of constructs and a class T S of substantial individuals ...»

    Mixed Categories

    Classical Categories

    Aristotle divided everything there is into 10 ``logical categories'' (supreme genera) based on an extension of his substance:accident dichotomy [
    AUOOP].
    mode of being subdivision category
    substance
    exists in itself and not in another
      SUBSTANCE
    accidents
    exist not in itself but in something else, i.e., ultimately they belong to or inhere in some substance
    an object's
    intrinsic
    accidents
    absolutely intrinsic
    inheres in one oject alone
    QUANTITY
    QUALITY (eg. courage) - something which can be possessed by, and attributed to, something [x]. C.f. primary qualities (e.g., shape) vs. secondary properties (e.g., color) [x].
    relatively intrinsic
    inheres in the object but refers to another object
    RELATION (internal/external)
    -> subclassification of relations
    extrinsic
    accidents
    causallooked at the object as a causeACTIVITY
    in the object as an effectPASSIVITY
    measuredby timeWHEN
    by place WHERE
    according to the disposition of internal parts (relative place)POSITION
    other
    (e.g., decorations, clothes, ownership ...)
    HABIT

    The Stoics had a list of four categories: substrate, qualified, disposed, relatively disposed [x]


    Dölling's categories

    «Taking the ontological distinctions expressed in natural languages seriously, my starting point is that we conceptually disciminate between at least the following categories of entities: things like dogs or cups, personst like men or pupils, stuffs like gold or water, configurations like piles or heaps, groups like teams and families, institutions like offices or schools as well as kinds like kinds of things or kinds of stuff.» [OntDom]
    entity object instance of kind physical object stuff constitutes thing
    aggregate thing (of stuff), several may constitute configurations non-person
    person constitute group, associated with institution
    configuration (of things)
    social object (of persons) group
    institution
    kind (of objects)
    «[E]ach of the domains .. includes two sub-domains: the domain of atomic entities and the domain of plural entities of the category in question.» [OntDom]
    «Each of these domains has a separate internal structure and is conected with other domains by specific relations. A fundamental aspect of structure is the relationship between part and whole. Following previous proposals ..., I assume that there are different but analogous part-whole relations, giving a typical strucure to each of the relevant domains. In this view, ther is a general mereological theory that provides the formal skeleton of the special part-whole relations. ...
    «The elements of T, G and C [things, groups and configurations] have the chracteristic that they are composed of elements of other domains. For example, a cup ... can be made up of a quantity of matter like gold. A group like a team or a family is constituted by a plurality of persons, and a configuration like a pile consists of a plurality of things. Evidently, a group or a configuration is not identical with the mereological sum of its consitutents, a thing is not identical with the stuff of which is it composed. Rather people constituting a group are organized in a certain way and are connected by specific social relations. One and the same plurality of persons can consitute different groups at the same time. In the constrast to groups, configurations are determined by particular spatial relations between the things making up them.» [OntDom]

    Grossmann's categories and STATE OF AFFAIRS

    Mainly from [OntRed 177-190]
    ENTITY STATE OF AFFAIRS
    "discovered" 1902/10 by Meinong
    as the intentions of judgements
    and assumptions [x]
    =/= proposition which were introduced as that which exists for every true and false sentence, so that logical connectives always have some existent to relate [OntRed 42]
    Grossmann has no use for propositions. since his connectives (like the relations of intentionality, constituent, and, obviously, exemplification [of state-of-affairs and of entity]) can also relate non-obtaining = non-existing states-of-affairs! (obtaing = existing states-of-affairs are a.k.a. facts)
    Quantified vs. non-quantified (atomic vs. molecular (contains negation and/or connectives))
    Equal if containing the same constituents in same order and number
    THING INDIVIDUAL mainly: temporal and spatio-temporal
    STRUCTURE in particular: spatial and/or temporal
    CLASS  
    RELATION attached to (two) entities.
    1. bridging main categories (nexus): exemplification, membership, part (of structure), constituent (of state-of-affairs), intentionality (betw. content of mental act and s/o/a), spatial & temporal relations (betw. individual and structure)
    2. within main categories (connection): between properties, arithmetical relations (betw. quantifiers), among states of affairs
    3. identity (a connection?), diversity (a nexus?)
    PROPERTY The main bearers of properties are individuals and (some) structures. But also a property (eg, red) can have a property (eg, being-a-color)
    QUANTIFIER numbers, "all", "some", "none", "the"
    EXISTENCE attached to "existents" = all things, and obtaining states-of-affairs (existence is not a "property" with which existents are related by "exemplification")
    NEGATION attached to non-obtaining state-of-affairs (there is no relation of negative exemplification)
    «If I were tempted to make deep pronouncements in a calm manner, I would say that it is an ontological feature of our world that individual things are characterized primarily by the properties they have, while numbers and classes are primarily (or, perhaps, only) characterized by the relations numbers have to other numbers and classes have to other classes.» [OntRed 54f]

    Relations, Roles, Contexts

    The status of relations is «the most central of all philosophical problems» [x]. «The nature of relations first became an important metaphysical issue in modern philosophy with Leibniz. He regarded it as a problem where the relation R which links individuals a and b is located. It cannot just be in one of them, for it would not then link them, nor can it be in some kind of void between them. Such reflections on relations were one main source for his monadistic metaphysics of windowless monads. For he had to interpret 'a is R to b' as ascribing a separate predicate to each of a and b. 'Adam is the father of Cain' thus means that Adam has a certain property (being father of such-and-such a person) and Cain has a certain property (being child of such-and-such a father). These two individuals thus have properties which in a manner reflect each other but which do not bring them really together except in an 'ideal' or 'conceptual' way.» [x].
    Individual / Role / Context
    A somwhat similar distinction between the individual object, its role towards others, and that relating context in which objects have roles towards one another seems to be expressed in Peirce's Firstness, Secondness, Thirdness (1891) [from TOC 677f]: «"First is the conception of being or existing independent of anything else. Second is the conception of being relative to, the conception of reaction with, something else. Third is the conception of mediation, whereby a first and a second are brought into relation"
    As Firstness, the type Woman represents a kind of person existing independent of anything else. But the same individual could be considered relative to or in reaction with many other things, as in the concept types Mother, Attorney, Wife, Pilot, Pedestrian, or Employee. These roles are examples of Secondness. They represent the individual in relation to another type, such as Child, Client, Husband, Airplane, Street, or Employer. Thirdness is a conception of mediating circumstances that bring the first and second into relation. Motherhood, which comprises the act of giving birth and the subsequent period of nuturing, relates the mother and the child. The legal system gives rise to the roles of attroney and client. ... These mediating situations are examples of Thirdness, whether they are traditionally recognized categories like Motherhood and Aviation or whether they are unnamed categories like walking-where-other-people-are-driving.
    Firstness is independent, Secondness reacts to something else, and Thirdness involves some mental mediation. As an example, a human may make an animal (Firstness) into a pet (Secondness), by establishing a contract (Thirdness) with it. ... Peirce's categories apply equally well to actions ... :
    1. Brutus stabbed Caesar.
    2. Brutus killed Caesar.
    3. Brutus murdered Caesar.
    An act of stabbing is a Firstness that can be recognized by objective criteria at the instant it happens. No other events or mental attitudes need to be considered in identifying an act of stabbing. Killing is a Secondness that depends on whether the victiim dies. ... [T]he act of stabbing does not become a killing unitl after the event of dying. Murder is a Thirdness that depends on the motives of the agent. ...»
    physical things information things sign
    Firstnessentity form representamen
    Secondnessrole proposition object
    Thirdnesscircumstances theory interpretant
    Meinong (1882) recognizes that there are mind-independent relations. «Like Frege and Russell, he thus breaks with a long philosophical tradition, according to which relations are merely the creations of mental acts of comparison» [x].
    «Relations might seem to be special sorts of object which can connect other things, but which are numerically distinct and ontologically independent from items they connect. But then, by an argument best known from F. H. Bradley, 3 is not the successor of 2 unless in addition to 'successor', there is a second relation - 'connector', say - which links the numbers to 'successor', a third relation to connect 'connector' to 'successor', and so on. Frege avoids this sort of regress by treating relations as structurally incomplete partial objects which cannot occur without relata to complete them.» Cf.: Wittgenstein's Tractatus does without relations as ontologically basic items [x]. «An alternative solution from Wittgenstein's Tractatus banishes relations from the ranks of ontologically basic items: basic objects hang together without connectors like links in a chain, and facts which seem to involve relations between non-basic objects reduce to chainlike concatenations of basic objects.»
    The distinction was made between relations on which the nature/identity of a participant depends ("internal" aka "intrinsic" relations), and relations which are irrelevant to a participant's nature/identity ("external" aka "extrinsic" relations) [x, x, x].

    States and Events

    State. [MB3 123f] «Centrality of the State Concept --- Every thing is - at a given time associated with a given reference frame - in some state or other. This is a hypothesis about the furniture of the world and, since it does not specify either the kind if thing or the kind of state, it is ontological. It is not a self evident assumption. For one thing it is rarely formulated explicitly. For another the world might be constituted in such a way that the assumption be false. Moreover according to the classicist interpretations of the quantum theory the latter fails to assign definite states to its referents. But this is mistaken: the truth is that the theory does not assign its referent classical states such as sharp position and velocity values, but quantum states such as position and velocity probability distributions.
    The ontological hypothesis that every thing is in some state or other underlies all science, has invaded philosophy, and has spilled over to ordinary knowledge, to the point that statesmen speak of the state of the nation. Each exact scientific theory is of course in a position to give a precise characterization of the concept of a state. But it will be concerned with a particular kind of state, such as the dynamical or the chemical or the physiological or the economic state of its reference [referent?], not with the generic concept of state of a thing. To elucidate the latter concept is the business of exact ontology, in particular of system theory.
    Surprisingly enough, systems theory has so far failed to give an exact and general enough analysis of the concept of the state of a system. To begin with the usual accounts (e.g. Zadeh and Desoer, 1963; Mesaraovi'c and Takahara, 1975; Pabdulo and Arbib, 1974) do not apply either to continuous systems such as fields or to quantum- mechanical systems. Moreover the concept of a reference frame has no place in those accounts, probably because it is not needed in automate theory, electrical network theory, and a few other theories. Yet the concept is central to many other theories. ... For example, it occurs in the explanation of the working of an electrical motor - not to speak of the underlying theories of mechanics and electrodynamics. The notion of a reference frame is in fact so central in physics that the states of any real physical system are relavtive to some frame or other ...
    A second concept one misses in systems theory is that of a law. ... [T]he general concept of a law - the philosophical concept as distinct from a particular law statement such as Ohm's - ought to play some role in systems theory if only for a mathematical reason. Indeed, but for the laws - which place restrictions upon the ranges of the components of the function F occurring in any functional schema of a thing - we should accept the usual characterization of the collections of possible states (or state spaces) as vector spaces or even as inner product or metric spaces. The existence of laws ruins this characterization. ...
    Nor have metaphysicians exactified the notion of state ... Likewise the various systems of inductive logic employing the concepts of state and of state description fail to analyze them in a manner consistent with the concepts of state occurring in science.»
    [MB3 132] Definiteness of state «We may certainly assume that, whether we know it or not, each thing - in particular each isolated thing - is in a definite state relative to some reference frame and at each instance (or else point in spacetime). Yet our representation of such a state will depend upon the state function chosen to represent the thing - which choice depends in turn upon the state of our knowledge as well as upon our goals.»

    Event. «An event is sometimes defined as a change (for example, the loss or acquisition of a property by something) ... However, many theories of events include states that consist in things' having (or retaining) properties (e.g. the lawn's staying wet) as well as changes that consist in their acquiring or losing them (e.g. the lawn's becoming dry)» [x].
    Events can be regarded as identical iff they have exactly the same causes and effects (Davidson's first answer), or iff they occupy exactly the same places at the same times (Quine and Davidson's second answer), or iff they consist in the same objects' having the same properties at the same times (Jaegwon Kim). [x].

    Cf. process philosophy [x].

    «Every collection of events is a set of changes in some thing or other. We have found no use for the fiction that the are changes that fail to consist in modifications of the states of some thing or other. Anyone claiming that there are such changes in reality should exhibit empirical evidence to this effect and proceed to build a theory of such thingless (or immaterial) changes.
    Nevertheless once in a while philosophers and even scientists are found claiming that there are such thingless changes. ... One of them is the information process, sometimes regarded as not being based on the transport of matter or the propagation of fields. The reason for this misconception is that statistical information theory is a black box or phenomenonological theory so general that it disregards the precise kind of signal carrying the information, the information transmission mechanism, and the kind(s) and quantities of energy involved. For this reason information theory is a nonphysical theory: it is instead a theory qualifying as a piece of scientific metaphysics, since it deals in an extremely general way with a genus of conrete things. But, of course, information is a property of certain physical (or chemical or biological) processes, namely signals, which are processes of a kind. No signal, no information transmission. And signals, let us repeat, are chains of events occuring in concrete things: the transmission of information consists in events propagating across space and carrying energy. Remove such real processes and only parapsychological anecdotes remain» [MB3 271f, underlining added].


    Ulf Schünemann 250402, 120502