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26 มีนาคม 2021, 09:00
In mathematics, a binary relation R over 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.
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.