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Dec 2, 2009
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Dictionary of Phrase and Fable—Q

Q.E.D

Quod erat demonstrandum. Three letters appended to the theorems of Euclid, meaning: Thus have we proved the proposition stated above, as we were required to do.

Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894
Q.E.F
Q
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