Q.E.D. is an abbreviation for the Latin phrase "quod erat demonstrandum," which translates to "which was to be demonstrated" or "which was to be proved." It is often used at the end of mathematical proofs or philosophical arguments to indicate that the proof is complete and has successfully established the proposition that was intended to be demonstrated. The phrase has a long history in mathematics and logic, serving as a formal way to conclude an argument or proof.
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