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CQFD - translation to English
ABBREVIATION TO INDICATE THE COMPLETION OF A MATHEMATICAL PROOF
Quod erat demonstrandum; Cqfd; Q.E.D; Quad Erat Demonstrandum; Q.E.F.; Quod Erat Demonstrandum; Quod Erat Demonstrantum; Q.e.d.; Q E D; Q. E. D.; Q.E.F; Quod erat demonstratum; Quod erat faciendum; Ὅπερ ἔδει δειξαι; QEF; Proving a point; C.Q.F.D.; Ὅπερ ἔδει δεῖξαι; Quod erat demonstrandom
![Ethics]]'', Part 1, ''Q.E.D.'' is used at the end of ''Demonstratio'' of ''Propositio III'' on the right hand page](https://commons.wikimedia.org/wiki/Special:FilePath/Spinoza Ethica Pars1 Prop1.jpg?width=200 "Ethics]]'', Part 1, ''Q.E.D.'' is used at the end of ''Demonstratio'' of ''Propositio III'' on the right hand page")
CQFD
Q.E.D., quod erat demonstrandum, which was the thing to be proved (Latin)
Definition
quod erat demonstrandum
[kw?d ??rat d?m?n'strand?m]
used, especially at the conclusion of a formal proof, to convey that something demonstrates the truth of one's claim.
Origin
L., lit. 'which was to be demonstrated'.
Wikipedia
Q.E.D.
Q.E.D. or QED is an initialism of the Latin phrase quod erat demonstrandum, meaning "which was to be demonstrated". Literally it states "what was to be shown". Traditionally, the abbreviation is placed at the end of mathematical proofs and philosophical arguments in print publications, to indicate that the proof or the argument is complete.
Examples of use of CQFD
1. Or, le magnésium aide ŕ s‘adapter ŕ l‘altitude...» CQFD.
2. L‘explication est simple: c‘est l‘omniprésence, ŕ Washington, du «lobby d‘Israël». CQFD.
3. En réglant la question du régime érythréen, on r';gle l‘afflux de réfugiés, CQFD.
4. CQFD. © Le Temps, 2008 . Droits de reproduction et de diffusion réservés.
5. Un bout d‘éternité. CQFD? © Le Temps, 200' . Droits de reproduction et de diffusion réservés.