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\in

The symbol \in is used in mathematics to denote set membership. It indicates that an element belongs to a set.

Examples

The element x is a member of the set of real numbers.

x \in \mathbb{R}

The element a is a member of the set A.

a \in A

The number 5 is an element of the set containing 1, 2, 3, 4, and 5.

5 \in \{1, 2, 3, 4, 5\}