herefore, the members of the set, one set so it can be anything, such as numbers, people. The letter or set of sets, etc. The popular sets denoted by capital letters such as A, B, C, etc., as customary in that sentence sets A and B are equal. It means that both sets A and B are sets, all members the same (for example, all the members in A set, it must be a member of set B with A = B denoted by and, on the other hand, it is the same as denoted by B = A).