A ⊂ B A subset B A⊂B. That sideways-U thing is the subset symbol, and is pronounced “is a subset of”. 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”.

What does ⊆ mean in math?

A subset is a set whose elements are all members of another set. The symbol “⊆” means “is a subset of”. Since all of the members of set A are members of set B, A is a subset of B. Symbolically this is represented as A ⊆ B.

What does ∩ mean in maths?

∩ The symbol ∩ means intersection. Given two sets S and T, S ∩ T is used to denote the set {x|x ∈ S and x ∈ T}. For example {1,2,3}∩{3,4,5} = {3}. The symbol means remove from a set.

more The set made by combining the elements of two sets. So the union of sets A and B is the set of elements in A, or B, or both. The symbol is a special “U” like this: ∪