• Originating from the Greek analogous hóper é[dei] deî[xai] (ὅπερ ἔδει δεῖξαι), meaning which had to be demonstrated. The phrase is traditionally placed in its abbreviated form ([Q.E.D].) at the end of a mathematical proof or philosophical argument. Phrase synonymous with Quite Easily Done.


    Quod erat demonstrandum meaning & definition 1 of Quod erat demonstrandum.

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