Crossword Genius

Mathematical rule (7)

Ross

I believe the answer is:

theorem

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

This is all the clue.

(Other definitions for theorem that I've seen before include "Logical proposition" , "Statement to be proved in maths" , "Geometrical proposition to be proved" , "Mathematical statement to be proved" , "Hero met (anag) - principle that's proven" .)

I've seen this clue in The Times.
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