from Wiktionary, Creative Commons Attribution/Share-Alike License
- which was to be proved; which was to be demonstrated.
From Latin quod erat dēmonstrandum ("that which was to be proved"), calqued from Ancient Greek ὅπερ ἔδει δεῖξαι (hoper edei deixai, "precisely what was required to be proved"). (Wiktionary)
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