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The in relationship indicates that an object belongs to a set (equivalently, that the set contains the object).
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Notation
<MATH> \Large \in </MATH>
Example
<MATH>\Large 1 \in \{1,2,3,4\}</MATH>
Set Theory - The in operator
The in relationship indicates that an object belongs to a set (equivalently, that the set contains the object).
<MATH> \Large \in </MATH>
<MATH>\Large 1 \in \{1,2,3,4\}</MATH>