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Q.E.D. or QED is an initialism of the Latin phrase quod erat demonstrandum, meaning "that which was to be demonstrated". Literally, it states "what was to be shown". [ 1 ] Traditionally, the abbreviation is placed at the end of mathematical proofs and philosophical arguments in print publications, to indicate that the proof or the argument is ...
quod erat demonstrandum : what was to be demonstrated: The abbreviation is often written at the bottom of a mathematical proof. Sometimes translated loosely into English as "The Five Ws", W.W.W.W.W., which stands for "Which Was What We Wanted". quod erat faciendum (Q.E.F.) which was to be done: Or "which was to be constructed".
Q.E.D. (quod erat demonstrandum), used at the end of a mathematical proof; Quantum electrodynamics, a field in particle physics; QED manifesto and project, a database of mathematical knowledge; QED: The Strange Theory of Light and Matter, a 1985 physics book by Richard Feynman
In mathematics, the tombstone, halmos, end-of-proof, or Q.E.D. symbol "∎" (or " ") is a symbol used to denote the end of a proof, in place of the traditional abbreviation "Q.E.D." for the Latin phrase "quod erat demonstrandum". It is inspired by the typographic practice of end marks, an element that marks the end of an article. [1] [2]
ad quod damnum: to whatever damage: i.e., "according to the harm" or "in proportion to the harm". The phrase is used in tort law as a measure of damages inflicted, implying that a remedy (if one exists) ought to correspond specifically and only to the damage suffered. cf. damnum absque iniuria. ad referendum (ad ref) to reference
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"quod erat demonstrandum" "what was required to be proved" Used by early mathematicians including Euclid (Elements, 1.4), Aristotle (APo.90b34), and Archimedes, written at the end of a mathematical proof or philosophical argument, to signify the proof as complete. Later it was latinized as "QED" or the Halmos tombstone box symbol.