Which was demonstrated; -- a phrase used after the conclusion of some line of reasoning, especially in mathematical or logical proofs.

QED abbr. Latin Quod erat demonstrandum (which was to be demonstrated or that proves it.) Acronym for: Quite Easily Done

abbreviation of Latin (Qoud Erat Demonstandum- that which has been proven) originally used in English by mathematicians after a theory had been proven, nowadays meaning generally "it has just been proven correct" or "I was right" (Crave).

Quod Erat Demonstrandum; Latin for "which was to be demonstrated," when something is proved wrong.

Quod est demonstrandum "Il che è da dimostrarsi"

( latin) literally, "quod erat demonstrandum" — meaning that which was to be demonstrated, used to formally earmark the end of a logical or mathematical proof

to be shown, to be proven

quod erat demonstrandum : which was to be demonstrated Latin acronym