What is a ∩ B?Ī intersection B is a set that contains elements that are common in both sets A and B. The formula for the number of elements in A union B is n(A U B) = n(A) + n(B) – n(A ∩ B). The symbol ∈ indicates set membership and means “ is an element of” so that the statement x∈A means that x is an element of the set A. To show something is not a subset, you draw a slash through the subset symbol, so the following:is pronounced as “B is not a subset of A”. That sideways-U thing is the subset symbol, and is pronounced “is a subset of”. What is a sideways U in math?Ī ⊂ B A subset B A⊂B.
The term is also used for a 1-tuple (a sequence with one member). For example, if A is the set is a singleton containing the element null. The union of a set A with a B is the set of elements that are in either set A or B.
If A ⊆ B, then the elements of A are also the elements of set B. Recent post: Do Employers Care If Your Degree Is Online? What does ⊆ mean in set?
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