quod erat demonstrandum

The story

1. Ancient Greek · derived fromὅπερ ἔδει δεῖξαι“precisely what was required to be proved”
2. Latin · borrowed fromquod erat dēmōnstrandum“that which was to be proved”
3. English todayquod erat demonstrandum

Borrowed from Latin quod erat dēmōnstrandum (“that which was to be proved”), calqued from Ancient Greek ὅπερ ἔδει δεῖξαι (hóper édei deîxai, “precisely what was required to be proved”).

Words from the same roots