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- "Quod erat demonstrandum" meaning, of course, that that "which was to be proved" had actually been proved.
www.jstor.org/stable/27955054
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Origins: Quod Erat Demonstrandum. Aristotle was the first thinker to know how he was thinking logically. When did people begin to think logically? There is no answer to this question.
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).
What does the phrase quod erat demonstrandum mean? There are two meanings listed in OED's entry for the phrase quod erat demonstrandum . See ‘Meaning & use’ for definitions, usage, and quotation evidence.
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".
"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.
Nov 21, 2023 · In Quod erat demonstrandum the sense of necessity can be attributed completely to the gerundive. As in our case, often the gerundive is coupled with the verb esse (to be) - most famously in Censeo Carthaginem esse delendam ("I think Carthage must be destroyed").
Definition. Quod erat demonstrandum is a Latin phrase meaning 'which was to be demonstrated.'. It is often abbreviated as Q.E.D. and is traditionally used at the end of a mathematical proof or philosophical argument to signify that the proof has been completed successfully.
