Combining Philosophers

Ideas for Rescher,N/Oppenheim,P, Harold Noonan and Susan A. Gelman

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6 ideas

9. Objects / F. Identity among Objects / 2. Defining Identity

16015

Problems about identity can't even be formulated without the concept of identity [Noonan]

16017

Identity is usually defined as the equivalence relation satisfying Leibniz's Law [Noonan]

16016

Identity definitions (such as self-identity, or the smallest equivalence relation) are usually circular [Noonan]

16020

Identity can only be characterised in a second-order language [Noonan]

9. Objects / F. Identity among Objects / 8. Leibniz's Law

16018

Indiscernibility is basic to our understanding of identity and distinctness [Noonan]

16019

Leibniz's Law must be kept separate from the substitutivity principle [Noonan]