One thing is tautologically identical to itself, but two different things cannot be identical {paradox of identity} {identity paradox}. Identity cannot be one relation. Identity requires conjunction of two propositions.
John Locke imagined that he had a sock with a hole. Is a mended sock the same sock {Locke's sock} {Locke sock}?
Theseus returned from Crete in a thirty-oared ship. Athenians preserved his ship and, as years passed, replaced planks. Is a ship that has replaced parts the same ship {Theseus' paradox} {Theseus paradox} {Ship of Theseus}? Do things that grow maintain their identity? Is a second ship, built from the old planks, the original ship?
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Date Modified: 2022.0225