間違える: to make a mistake; to confuse

mathematics (field of study)

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend

distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend

he; boyfriend

question, problem on homework etc. / a question; a matter (of time etc.) / a problem (something that needs to be dealt with); a trouble / an issue; a matter

to make a mistake; to make an error (i.e. in calculation) / to confuse, to mistake something for something else

to misrecognize; to read something wrong, etc.

(mathematics) pure mathematics

applied mathematics