Q.E.D.
abbreviation to indicate the completion of a mathematical proof From Wikipedia, the free encyclopedia
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Q.E.D. is an acronym or initialism of the Latin phrase quod erat demonstrandum, which means "what was to be demonstrated". In other words, Q.E.D. means "something was to be proven, and now it has been done".[1][2]
History
In the European Renaissance, scholars often wrote in Latin. The phrases Q.E.D. was often used at the end of mathematical or philosophical proofs.[3]
Equivalents in other languages
Q.E.D. is used in many languages, including:
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