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When a mathematically capable person explains a math problem to a less mathematically capable person, typically in a manner regarded as condescending or patronising. Like mansplaining, except that it actually exists.
Math HL student: "Uh, you can't get the square root out of a negative number. Unless you're using irrationals"
Math studies student: "Stop mathsplaining to me!"
by FanterPanter December 10, 2017
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