13127
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Categories can't overlap; they are either disjoint, or inclusive [Sommers, by Westerhoff]
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Full Idea:
Fred Sommers, in his treatment of types, says that two ontological categories cannot overlap; they are either disjoint, or one properly includes the other. This is sometimes referred to as Sommers' Law.
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From:
report of Fred Sommers (Types and Ontology [1963], p.355) by Jan Westerhoff - Ontological Categories §24
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A reaction:
The 'types', of course, go back to Bertrand Russell's theory of types, which is important in discussions of ontological categories. Carnap pursued it, trying to derive ontological categories from grammatical categories. 85% agree with Sommers.
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14508
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A 'thisness' is a thing's property of being identical with itself (not the possession of self-identity) [Adams,RM]
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Full Idea:
A thisness is the property of being identical with a certain particular individual - not the property that we all share, of being identical with some individual, but my property of being identical with me, your property of being identical with you etc.
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From:
Robert Merrihew Adams (Primitive Thisness and Primitive Identity [1979], 1)
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A reaction:
These philosophers tell you that a thisness 'is' so-and-so, and don't admit that he (and Plantinga) are putting forward a new theory about haecceities, and one I find implausible. I just don't believe in the property of 'being-identical-to-me'.
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12034
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If the universe was cyclical, totally indiscernible events might occur from time to time [Adams,RM]
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Full Idea:
There is a temporal argument for the possibility of non-identical indiscernibles, if there could be a cyclical universe, in which each event was preceded and followed by infinitely many other events qualitatively indiscernible from itself.
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From:
Robert Merrihew Adams (Primitive Thisness and Primitive Identity [1979], 3)
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A reaction:
The argument is a parallel to Max Black's indiscernible spheres in space. Adams offers the reply that time might be tightly 'curved', so that the repetition was indeed the same event again.
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14510
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Two events might be indiscernible yet distinct, if there was a universe cyclical in time [Adams,RM]
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Full Idea:
Similar to the argument from spatial dispersal, we can argue against the Identity of Indiscernibles from temporal dispersal. It seems there could be a cyclic universe, ..and thus there could be distinct but indiscernible events, separated temporally.
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From:
Robert Merrihew Adams (Primitive Thisness and Primitive Identity [1979], 3)
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A reaction:
See Idea 14509 for spatial dispersal. If cosmologists decided that a cyclical universe was incoherent, would that ruin the argument? Presumably there might even be indistinguishable events in the one universe (in principle!).
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16455
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Black's two globes might be one globe in highly curved space [Adams,RM]
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Full Idea:
If God creates a globe reached by travelling two diameters in a straight line from another globe, this can be described as two globes in Euclidean space, or a single globe in a tightly curved non-Euclidean space.
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From:
Robert Merrihew Adams (Primitive Thisness and Primitive Identity [1979], 3)
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A reaction:
[my compression of Adams's version of Hacking's response to Black, as spotted by Stalnaker] Hence we save the identity of indiscernibles, by saying we can't be sure that two indiscernibles are not one thing, unusually described.
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11901
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Haecceitism may or may not involve some logical connection to essence [Adams,RM, by Mackie,P]
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Full Idea:
Moderate Haecceitism says that thisnesses and transworld identities are primitive, but logically connected with suchnesses. ..Extreme Haecceitism involves the rejection of all logical connections between suchness and thisness, for persons.
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From:
report of Robert Merrihew Adams (Primitive Thisness and Primitive Identity [1979]) by Penelope Mackie - How Things Might Have Been
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A reaction:
I am coming to the conclusion that they are not linked. That thisness is a feature of our conceptual thinking, and is utterly atomistic and content-free, while suchness is rich and a feature of reality.
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12032
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Direct reference is by proper names, or indexicals, or referential uses of descriptions [Adams,RM]
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Full Idea:
Direct reference is commonly effected by the use of proper names and indexical expressions, and sometimes by what has been called (by Donnellan) the 'referential' use of descriptions.
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From:
Robert Merrihew Adams (Primitive Thisness and Primitive Identity [1979], 2)
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A reaction:
One might enquire whether the third usage should be described as 'direct', but then I am not sure that there is much of a distinction between references which are or are not 'direct'. Either you (or a sentence) refer or you (or it) don't.
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