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quod erat demonstrandum

The Oxford Dictionary of Phrase and Fable | 2006 | Copyright

quod erat demonstrandum used to convey that a fact or situation demonstrates the truth of one's theory or claim, especially to mark the conclusion of a formal proof; the Latin phrase, meaning literally ‘which was to be demonstrated’, is a translation of the Greek phrase used in a number of Euclid's propositions. It is frequently abbreviated to QED.

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ELIZABETH KNOWLES. "quod erat demonstrandum." The Oxford Dictionary of Phrase and Fable. 2006. Encyclopedia.com. 10 Feb. 2010 <http://www.encyclopedia.com>.

ELIZABETH KNOWLES. "quod erat demonstrandum." The Oxford Dictionary of Phrase and Fable. 2006. Encyclopedia.com. (February 10, 2010). http://www.encyclopedia.com/doc/1O214-quoderatdemonstrandum.html

ELIZABETH KNOWLES. "quod erat demonstrandum." The Oxford Dictionary of Phrase and Fable. 2006. Retrieved February 10, 2010 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O214-quoderatdemonstrandum.html

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