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'fragments/reports', 'Principia Mathematica' and 'Letters to Thomasius'
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9. Objects / D. Essence of Objects / 1. Essences of Objects
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The essence of a circle is the equality of its radii [Leibniz]
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9. Objects / F. Identity among Objects / 7. Indiscernible Objects
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An object is identical with itself, and no different indiscernible object can share that [Russell/Whitehead, by Adams,RM]
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