quod erat demonstrandum

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Latin phrase quod erat de·mon·stran·dum \ ˌkwȯd-ˈer-ˌät-ˌde-mən-ˈstran-dəm , -ˌdā-ˌmȯn-ˈsträn-ˌdu̇m \

Definition of quod erat demonstrandum

:which (is what) was to be shown (originally) abbreviation QED used at the end of a logical or mathematical proof

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