An element is an item that belongs to a set. If , then is an element of .
You write to say " is in ." You write to say " is not in ."
The symbol is read as "is an element of" or just "in." This symbol appears everywhere in set theory.
##### ###### ##### ### # # ### # # ###### ## ## ## ## ## ## ## # # # # # ## ##### #### ##### # # # # # # # #### ## # ## ## ## ## # # # # # ## ## # ###### ## ### # ### # ######
$ curl repovive.com/roadmaps/math-fundamentals/sets/vocabulary-element
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