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Q.E.D.

1.
which was to be shown or demonstrated (used especially in mathematical proofs).
Origin of Q.E.D.
1810-1820
First recorded in 1810-20, Q.E.D. is from the Latin word quod erat dēmōnstrandum
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Word Origin and History for Q.E.D.

1760, abbreviation of Latin quod erat demonstrandum "which was to be demonstrated."

Online Etymology Dictionary, © 2010 Douglas Harper
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