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3 ideas
19347 | Substance needs independence, unity, and stability (for individuation); also it is a subject, for predicates [Perkins] |
16981 | With the necessity of self-identity plus Leibniz's Law, identity has to be an 'internal' relation [Kripke] |
4942 | The indiscernibility of identicals is as self-evident as the law of contradiction [Kripke] |