Crossword Genius

The more complicated mathematical proof (7)

Ross

I believe the answer is:

theorem

I'm a little stuck... Click here to teach me more about this clue!

'mathematical proof' is the definition.
'theorem' can be an answer for 'proof' (I've seen this before). I am not sure about the 'mathematical' bit.

'the more complicated' is the wordplay.
'complicated' is an anagram indicator (a complex or confusing ordering of the letters).
'more' anagrammed gives 'orem'.
'the'+'orem'='THEOREM'

Can you help me to learn more?

(Other definitions for theorem that I've seen before include "mathematical achievement" , "speculation" , "Mathematical rule" , "Proven proposition" , "Formula to be proved" .)

I've seen this clue in The Globe and Mail.
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