Combining Texts
Ideas for
'Thinking About Mathematics', 'On Nature Itself (De Ipsa Natura)' and 'Identity and Existence in Logic'
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5 ideas
9. Objects / A. Existence of Objects / 4. Impossible objects
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's is non-existent' cannot be said if 's' does not designate [Anderson,CA]
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We cannot pick out a thing and deny its existence, but we can say a concept doesn't correspond [Anderson,CA]
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9. Objects / A. Existence of Objects / 5. Individuation / a. Individuation
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Individuation was a problem for medievals, then Leibniz, then Frege, then Wittgenstein (somewhat) [Anderson,CA]
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9. Objects / B. Unity of Objects / 2. Substance / d. Substance defined
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Substance is a force for acting and being acted upon [Leibniz]
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9. Objects / F. Identity among Objects / 7. Indiscernible Objects
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The notion of 'property' is unclear for a logical version of the Identity of Indiscernibles [Anderson,CA]
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