Quote:
Originally Posted by Hugh
Quod Erat Demonstandum… 
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ὅπερ ἔδει δεῖξαι
The phrase quod erat demonstrandum is a translation into Latin from the Greek ὅπερ ἔδει δεῖξαι (hoper edei deixai; abbreviated as ΟΕΔ).
qed or ΟΕΔ
That's how you finish a mathematical proof. \qed in latex