Set, a collection of well defined and distinct objects, ø or ❴ ❵, Null set or empty set, ∈, is an element of, ∉, is not an element of, #, Cardinal Number (number of elements in a set), True., 6 ∈ ℕ, False, B = ❴1, 4, 9, 16, 25, 36 ❵. 61 ∈ B..

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