In mathematics, a binary relation R {\displaystyle R} on a set X {\displaystyle X} is reflexive if it relates every element of X {\displaystyle X} to itself. 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.
In mathematics, a binary relation R {\displaystyle R} on a set X {\displaystyle X} is reflexive if it relates every element of X {\displaystyle X} to itself. 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.
Source: Wikipedia "Reflexive relation" · CC BY-SA 4.0
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