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کیوئیدی
Sign in to saveAlso known as QED, quod erat demonstrandum
Q.E.D. or QED is an initialism of the Latin phrase , meaning "that which was to be demonstrated". Literally, it states "what was to be shown". 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.