Crossword Genius

Proposition to be proved (7)

Ross

I believe the answer is:

theorem

'proposition to be proved' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for theorem that I've seen before include "Logical proposition" , "Statement to be proved in maths" , "A rule in algebra" , "Demonstrable proposition" , "Proven hypothesis" .)

I've seen this clue in the Jonesin', The Independent, the Irish Times (Simplex) and the Sydney Morning Herald.
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