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What is the difference between the symbols of "belonging" and "containing" in mathematics?
This is the concept in the first chapter of compulsory mathematics in high school.

Attribution is relative to an element and a set. If this element is in this set, even if this element belongs to this set, it does not belong to this set.

Inclusion means that, relative to two sets, if all the elements in one set are in another set, the latter set contains the previous set, or the previous set is contained in the latter set.