A collection A is a subset the a set B if every facet in A is additionally in B .

because that example, if A = 1 , 3 , 5 and also B = 1 , 2 , 3 , 4 , 5 , then A is a subset that B , and also we write

A ⊆ B

The heat under the sideways ∪ method that A may also be same to B (that is, they may be the same sets). If we desire to say the A is a appropriate subset of B (that means: it"s a subset, however there is at the very least one aspect in B that is not in A ) then we can remove the line:

A ⊂ B

To write that a set is not a subset of another set, just put a slash v the sideways ∪ :

B ⊄ A

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