quod erat demonstrandum

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quod erat demonstrandum

From Latin, literally "what was to be demonstrated," formally used at the conclusion of mathematical or philosophical proofs. In everyday speech and writing, it is used to emphasize that something proves a particular point or opinion. Commonly abbreviated as "QED." If the company's profits have gone up while their operating costs have gone down, then they have the money to pay their employees a better wage—quad erat demonstrat.
See also: quod
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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