Quod-erat-demonstrandum



[kwawd e-raht dey-mawn-strahn-doo m; English kwod er-uh t dem-uh n-stran-duh m] /kwɔd ˈɛ rɑt ˌdeɪ mɔnˈstrɑn dʊm; English kwɒd ˈɛr ət ˌdɛm ənˈstræn dəm/

Latin.
1.
which was to be shown or demonstrated.
/ˈkwɒd ˈɛræt ˌdɛmənˈstrændʊm/
uknown
1.
(at the conclusion of a proof, esp of a theorem in Euclidean geometry) which was to be proved QED
quod erat demonstrandum (Q.E.D.) [(kwawd er-aht dem-uhn-stran-duhm)]

A phrase used to signal that a proof has just been completed. From Latin, meaning “that which was to be demonstrated.”

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