Consider a red circle, and suppose it is a paradigmatic thing. Some philosophers maintain that a thing is ontologically analyzable into a particular exemplifying properties, those properties truly ascribed to the thing by the customary words. Our red circle, then, consists of a particular, say a; two properties, red and circle; and exemplification, a tie tying a, red, and circle into “the red circle.” Upon this analysis, a is bare, i.e., not re-recognizable as such, whereas red and circle are natured, (...) i.e., not bare, and, further, are universal, i.e., they may be exemplified by several particulars. (shrink)

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In the first place … it will be necessary to explain what an individual substance is. It is indeed true that when several predicates are attributes of a single subject and this subject is not an attribute of another, we speak of it as an individual substance, but this is not enough, and such an explanation is merely nominal. We must therefore inquire what it is to be an attribute in reality of a certain subject. ‘What is a Thing (substance)?’ (...) expresses two quite different problems. One belongs to ontology, the other to categorial analysis. (shrink)

Philosophers have long believed that if the Principle of the Identity of Indiscernibles were logically true, there would be no problem of individuation. I show (a) that if spatial relations are, as seems plausible, of such a nature that it makes no sense to say of one thing that it is related to itself, then the Principle is a logical truth, asserting that a certain kind of state of affairs is impossible because the kind of sentence purporting to express it (...) is ill-formed and (b) that even if the Principle were such a truth the problem of individuation would remain. I then examine some of what Leibniz and Wittgenstein have said about the notions of individuation, difference and nonidentity. (shrink)

Tractarian Semantics is full of claims that clash with the Tractatus, not to mention each other. There seems to be a method to it though. The book.

Tractarian Semantics is full of claims that clash with the Tractatus, not to mention each other. There seems to be a method to it though. The book.