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