What is the Greek version of "quod erat demonstrandum"?
Edit:
$\quad$The symbol $\square$ will denote the end of a proof; it may be read as "Q.E.D." abbreviating the Latin quod erat demonstrandum, which translates the Greek of Euclid of Alexandria "ὅπερ ἔδει δεῖξαι".
I found this in Bridge to Abstract Mathematics, but I was hoping to find something I could actually copy and paste into a tex file.
On
It originates from the Greek: hóper édei deîxai (ὅπερ ἔδει δεῖξαι), meaning "which had to be demonstrated". So the Latin Q.E.D. is a variation on the translation of the the expression used by the Greeks, namely, we know it was used by Euclid and Archimedes, and likely other Greek scholars who followed "suit."
Further clarification in the Wikipedia entry is truer to Euclid's use of the expression:
Since the verb "δείκνυμι" also means to show or to prove, a better translation from the Greek would read, "what was required to be proved."
Added: See also Earliers Known Uses of Mathematical Terms.
"ὅπερ ἔδει δεῖξαι" was used by Euclid and Archimedes.