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Fundamental (7)

Ross

'fundamental' is the definition.
(thesaurus)

This is the entire clue.

(Other definitions for theorem that I've seen before include "Formula to be proved" , "mathematical achievement" , "Logical proposition" , "Proof" , "A rule in algebra" .)

I've seen this clue in The Mirror, the Sydney Morning Herald, The Irish Times, The Guardian, The Star Tribune, the Penny Press, the Newsday, The Sun, the Evening Standard and The Telegraph.
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