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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.
"Quod erat demonstrandum" meaning, of course, that that "which was to be proved" had actually been proved. The use of this symbol at the end of a proof has long been discontinued, but that is a matter of trivial importance. The practice, however, of telling a student what he must prove in a given situation, a practice which made
"Quod erat demonstrandum" published on by Oxford University Press. “[That] which was to be demonstrated.”As was proved or explained previously. Commonly abbreviated Q.E.D.
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).
quod erat demonstrandum noun phrase Source: The Oxford Essential Dictionary of Foreign Terms in English Author(s): Jennifer Speake, Mark LaFlaur. M17 Latin (translating Greek hoti edei deixai).(Which is) what it was necessary to prove. ...
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").
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What does quod erat demonstrandum mean?
Why did Euclid use quod erat faciendum?
Is the 'necessity' aspect inherent in the gerundive 'demonstrandum' or '?
When was QED used in philosophy?
The earliest known use of the phrase quod erat demonstrandum is in the early 1600s. OED's earliest evidence for quod erat demonstrandum is from 1614, in the writing of William Bedwell, Arabist and mathematician.
