End Of A Mathematical Proof Crossword Clue — 3 Letters

One confident answer with explanation of the wordplay

QED
Best match
Q
E
D

QED stands for "quod erat demonstrandum" (Latin: "which was to be demonstrated"), the traditional phrase written at the end of a mathematical proof to signal its completion.

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Other possible answers
ENDGeneric word for end, but less specific to mathematical proofs
BOXThe Halmos symbol (tombstone/black box □) is used at the end of modern proofs instead of QED

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