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Quod erat demonstrandum, Q.E.D., QED
Which was the thing to be demonstrated; Which was to be demonstrated.

A formula appended at the end of a proof in geometry, or other mathematical solution, with the meaning, "We have proven the proposition we set out to prove."

Word Entries at Get Words: “q e d
Q.E.D., quod erat demonstrandum
which was to be demonstrated
This entry is located in the following unit: Abbreviations Frequently Encountered (page 3)