Quod erat demonstrandum

[Agnes]

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.