Crossword Genius

Mathematical subgroup (5)

Ross

I believe the answer is:

coset

'mathematical subgroup' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for coset that I've seen before include "subgroup" , "group in maths class" , "mathematical group" , "mathematicians' group" .)

I've seen this clue in The New York Times.
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