quod erat demonstrandum

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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