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I don’t understand the symbols in number 5 please

I don’t understand the symbols in number 5 please-example-1
User Cinder
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Binary Operations

The union of two sets A and B is denoted A ∪ B and

is defined as A ∪ B = x.

The intersection of two sets A and B is denoted A∩B

and is defined as A ∩ B = x ∈ A and x ∈ B.

Two sets are disjoint if they have no elements in common,

that is, A and B are disjoint if A ∩ B = ∅.

User Benjamin Mayo
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