Define a reflexive relation.

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Solution

In relation and functions, a reflexive relation is the one in which every element maps to itself.
For example, consider a set $A = {1, 2}$ .
Now, the reflexive relation will be $R = \{(1, 1), (2, 2), (1, 2), (2, 1)\}$ .
Hence, a relation is reflexive if: $(a, a) \in R \forall a \in A$ , where $a$ is the element, $A$ is the set and $R$ is the relation.

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