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The phrase quod erat demonstrandum is a translation into Latin from the Greek ὅπερ ἔδει δεῖξαι (hoper edei deixai; abbreviated as ΟΕΔ). The meaning of the Latin phrase is "that [thing] which was to be demonstrated" (with demonstrandum in the gerundive).
Q.E.D. or QED is an initialism of the Latin phrase Latin: '''quod erat demonstrandum''', meaning "that which was to be demonstrated". Literally it states "what was to be shown".
QED stands for quod erat demonstrandum ("it is demonstrated", Latin), and you put it at the end of a proof (usually mathematical) to say "done". Which would have taken you half a second to look up. The ironic use is to say that something proves something else when it clearly does not.
"Q.E.D." is an abbreviation derived from the Latin phrase "quod erat demonstrandum," which translates to "which was to be demonstrated" in English. It is used at the end of a proof or argument to signify that the desired outcome or conclusion has been successfully demonstrated or proven.
There are two meanings listed in OED's entry for the phrase quod erat demonstrandum. See ‘Meaning & use’ for definitions, usage, and quotation evidence.
Quod Erat Demonstrandum is a 2013 Romanian drama film directed by Andrei Gruzsniczki, starring Sorin Leoveanu and Ofelia Popii. It tells the story of two Romanian academics who are persecuted by Securitate, the secret police, in 1984.
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Quod Erat Demonstrandum is a 2013 Romanian drama film directed by Andrei Gruzsniczki, starring Sorin Leoveanu and Ofelia Popii. It tells the story of two Romanian academics who are persecuted by Securitate , the secret police, in 1984.
