quod erat demonstrandum
Latin phrase
quod erat de·mon·stran·dum
ˌkwȯd-ˈer-ˌät-ˌde-mən-ˈstran-dəm
-ˌdā-ˌmȯn-ˈsträn-ˌdu̇m
: which (is what) was to be shown (originally)
—abbreviation QED
—used at the end of a logical or mathematical proof
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Merriam-Webster unabridged
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