q. e. d


which was to be shown or demonstrated (used especially in mathematical proofs).

1810–20; < Latin quod erat dēmōnstrandum

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Word Origin & History

1760, abbrev. of L. quod erat demonstrandum "which was to be demonstrated."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Abbreviations & Acronyms
Latin quod erat demonstrandum (which was to be demonstrated)
The American Heritage® Abbreviations Dictionary, Third Edition
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