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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 ).
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.
Latin: Quod erat faciendum, originating from the Greek geometers' closing Greek, Ancient (to 1453);: ὅπερ ἔδει ποιῆσαι, meaning "which had to be done". Because of the difference in meaning, the two phrases should not be confused.
Dec 19, 2023 · Stein went to London with her brother Leo and, in 1903, wrote about the relationships through characters who were given pseudonyms in “Q.E.D.,” short for Quod Erat Demonstrandum, Latin for “which was to be demonstrated.”. The book clearly describes the love triangle that had consumed her for several years.
It was invented by Aristotle (384–322 B.C.) in Athens, and recorded in a group of writings known as the Organon. In one of these works, the Prior Analytics, Aristotle attempted to provide a complete analysis of the valid forms of reasoning.
Jun 11, 2006 · Then, after the conclusion, we were taught to print three letters, Q. E. D., which stood for the Latin words Quod erat demonstrandum: “that which had to be proved.” You remember the sign that Pilate wrote out and fastened upon the cross of Christ.
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Where did quod erat demonstrandum come from?
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When was QED used in philosophy?
The phrase originates from ancient Greek mathematics and philosophy, where demonstrating conclusions through rigorous proof was essential. In modern usage, Q.E.D. is still seen in academic writing, especially in mathematics, to affirm the validity of a proof.
