Friday, March 20, 2009

a.d. XIII Kal. Apr.

quod erat demonstrandum (Q.E.D.)
Literal translation: that which was to be proved

In an English sentence: The student who put his work on the board wrote quod erat demonstrandum beside the answer.

You might put this phrase or its abbreviation at the end of a math problem to show that your final answer is correct, and that you have proved what the problem required you to prove.

From Elizabeth Heimbach's book Latin Everywhere, Everyday