/ · 1894 Brewer’s · Q · Q.E.D
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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.
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Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.
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