Crossword Genius

Part of Q.E.D. (4)

Ross

I think it could be either:

erat

quod

(Other definitions for erat that I've seen before include "Quod - - demonstrandum (QED)" , "The E of QED" .)

I've seen this clue in the Newsday, the Penny Press, The Wall Street Journal, the LA Times, the King Feature Syndicate and The New York Times.
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