Short note demonstrates that identity is not intrinsic, relying on different frames of observation.
The Ship of Theseus puzzle asks: after replacing all parts of a ship over time, is it still the same ship? A reassembled version of the original parts is also presented. The puzzle assumes identity is a static, intrinsic property. This short note shows, using only elementary arithmetic, that identity is not intrinsic. It depends on the frame of observation.
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P. Phi (2026) studied this question.
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