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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 meaning of QUOD ERAT DEMONSTRANDUM is which (is what) was to be shown (originally) —abbreviation QED—used at the end of a logical or mathematical proof.
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".
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.
Quod erat demonstrandum means 'which was to be shown, or proved'. (at the conclusion of a proof, esp of a theorem in Euclidean geometry) which was to be proved.... Click for English pronunciations, examples sentences, video.
Oct 8, 2018 · Q.E.D. is an acronym for the Latin phrase quod erat demonstrandum, a fancy way to show off you just logically proved something.
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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.
