Combining Philosophers
Ideas for Peter Geach, Gottfried Leibniz and Gareth Evans
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13 ideas
9. Objects / F. Identity among Objects / 1. Concept of Identity
19394
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Inequality can be brought infinitely close to equality [Leibniz]
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9. Objects / F. Identity among Objects / 3. Relative Identity
16075
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Denial of absolute identity has drastic implications for logic, semantics and set theory [Wasserman on Geach]
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12152
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Identity is relative. One must not say things are 'the same', but 'the same A as' [Geach]
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9. Objects / F. Identity among Objects / 6. Identity between Objects
16224
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There can't be vague identity; a and b must differ, since a, unlike b, is only vaguely the same as b [Evans, by PG]
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9. Objects / F. Identity among Objects / 7. Indiscernible Objects
16504
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Two eggs can't be identical, because the same truths can't apply to both of them [Leibniz]
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5055
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No two things are totally identical [Leibniz]
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13178
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Things in different locations are different because they 'express' those locations [Leibniz]
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19411
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In nature there aren't even two identical straight lines, so no two bodies are alike [Leibniz]
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19412
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If two bodies only seem to differ in their position, those different environments will matter [Leibniz]
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17554
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There must be some internal difference between any two beings in nature [Leibniz]
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9. Objects / F. Identity among Objects / 8. Leibniz's Law
16073
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Leibniz's Law is incomplete, since it includes a non-relativized identity predicate [Geach, by Wasserman]
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9. Objects / F. Identity among Objects / 9. Sameness
8650
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Things are the same if one can be substituted for the other without loss of truth [Leibniz]
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11910
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Being 'the same' is meaningless, unless we specify 'the same X' [Geach]
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