Logician’s “as was proven”

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Possible Answers: QED.

Last seen on: LA Times Crossword 19 Jun 19, Wednesday

Random information on the term “QED”:

Q.E.D. or QED (sometimes italicized) is an initialism of the Latin phrase “quod erat demonstrandum”, literally meaning “what was to be shown”. Traditionally, the abbreviation is placed at the end of a mathematical proof or philosophical argument to indicate that the proof or argument is complete, therefore used with the meaning “thus it has been demonstrated”.


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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). Translating from the Latin into English yields, “what was to be demonstrated”, however, translating the Greek phrase ὅπερ ἔδει δεῖξαι produces a slightly different meaning. Since the verb “δείκνυμι” also means to show or to prove, a better translation from the Greek would read, “The very thing it was required to have shown.”

The Greek phrase was used by many early Greek mathematicians, including Euclid and Archimedes.

During the European Renaissance, scholars often wrote in Latin, and phrases such as Q.E.D. were often used to conclude proofs.

QED on Wikipedia