The difference (or ) is the set of elements in but not in .
For example, if and , then . You remove because it appears in .
Difference is not symmetric: differs from . Order matters here.
##### ###### ##### ### # # ### # # ###### ## ## ## ## ## ## ## # # # # # ## ##### #### ##### # # # # # # # #### ## # ## ## ## ## # # # # # ## ## # ###### ## ### # ### # ######
$ curl repovive.com/roadmaps/math-fundamentals/sets/vocabulary-difference
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