Q.E.D.
Abbreviation to indicate the completion of a mathematical or logical proof / From Wikipedia, the free encyclopedia
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For other uses, see QED.
Q.E.D. or QED is an initialism of the Latin phrase quod erat demonstrandum, meaning "that which was to be demonstrated". Literally it states "what was to be shown".[1] Traditionally, the abbreviation is placed at the end of mathematical proofs and philosophical arguments in print publications, to indicate that the proof or the argument is complete.