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Idea (7)

Ross

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10

'idea' is the definition.
(I know that theorem is a type of idea)

This is the entire clue.

(Other definitions for theorem that I've seen before include "Proven hypothesis" , "Proved mathematical hypothesis" , "(Maths) proposition" , "speculation" , "Mathematical formula" .)

I've seen this clue in The Independent, the Evening Standard, The Telegraph and the Penny Press.
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