# Reflexive relation

In mathematics, a binary relation R on a set X is reflexive if it relates every element of X to itself.[1][2]

An example of a reflexive relation is the relation "is equal to" on the set of real numbers, since every real number is equal to itself. A reflexive relation is said to have the reflexive property or is said to possess reflexivity. Along with symmetry and transitivity, reflexivity is one of three properties defining equivalence relations.