Crossword Genius

Mathematical proposition (7)

Ross

I believe the answer is:

theorem

'mathematical proposition' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for theorem that I've seen before include "A rule in algebra" , "Mathematical formula" , "(Maths) proposition" , "Mathematical rule" , "speculation" .)

I've seen this clue in The Guardian, the King Feature Syndicate, the New York Times, The Washington Post, the Wall Street Journal, The Telegraph, the L.A. Times Daily and The Times.
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