Crossword Genius

Mathematical concepts appearing in problem: massive (6)

Ross

I believe the answer is:

lemmas

'mathematical concepts' is the definition.
(type of theorem in mathematics)

'in problem massive' is the wordplay.
'in' says the answer is hidden in the clue.
'LEMMAS' is hidden in the letters of 'problem massive'.

'appearing' is the link.

(Another definition for lemmas that I've seen is " arguments".)

I've seen this clue in The Times.
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