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  1. en.wikipedia.org › wiki › QQ.E.D. - Wikipedia

    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).

  2. Sep 28, 2017 · Origin of Q.E.D.: 1760, abbreviation of Latin quod erat demonstrandum "which was to be demonstrated." ... See more.

  3. everything.explained.today › QQ.E.D. Explained

    Etymology and early use. The phrase quod erat demonstrandum is a translation into Latin from the Greek Greek, Ancient (to 1453);: ὅπερ ἔδει δεῖξαι (Greek, Ancient (to 1453);: hoper edei deixai; abbreviated as ΟΕΔ). Translating from the Latin phrase into English yields "that was to be demonstrated".

  4. "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.

  5. The earliest known use of the word Q.E.D. is in the early 1600s. OED's earliest evidence for Q.E.D. is from 1614, in the writing of William Bedwell, Arabist and mathematician. Q.E.D. is a borrowing from Latin. Etymons: Latin q.e.d..

  6. These initials stand for the Latin quod erat demonstrandum meaning, ‘what was to be demonstrated’. It was coined by Euclid in Greek c. 300 BC but it is better known in its Latin translation. The expression QED is typically used by mathematicians and philosophers to conclude proofs and arguments.

  7. Oct 5, 2024 · English. [edit] WOTD – 24 January 2020. Etymology. [edit] From Late Latin QED, from Latin quod erat demonstrandum. [1] Pronunciation. [edit] (Received Pronunciation) IPA (key): /ˌkjuːiːˈdiː/ Audio (Received Pronunciation): (General American) IPA (key): /ˌkjuˌiˈdi/ Phrase. [edit] Q.E.D.