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  2. Reflexive relation - Wikipedia

    en.wikipedia.org/wiki/Reflexive_relation

    Reflexive relation. In mathematics, a binary relation on a set is reflexive if it relates every element of 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 ...

  3. Reflexivity (social theory) - Wikipedia

    en.wikipedia.org/wiki/Reflexivity_(social_theory)

    In epistemology, and more specifically, the sociology of knowledge, reflexivity refers to circular relationships between cause and effect, especially as embedded in human belief structures. A reflexive relationship is multi-directional when the causes and the effects affect the reflexive agent in a layered or complex sociological relationship.

  4. Equivalence relation - Wikipedia

    en.wikipedia.org/wiki/Equivalence_relation

    A reflexive and symmetric relation is a dependency relation (if finite), and a tolerance relation if infinite. A preorder is reflexive and transitive. A congruence relation is an equivalence relation whose domain X {\displaystyle X} is also the underlying set for an algebraic structure , and which respects the additional structure.

  5. Relation (philosophy) - Wikipedia

    en.wikipedia.org/wiki/Relation_(philosophy)

    An equivalence relation is a relation that is reflexive, symmetric, and transitive, like equality expressed through the symbol "=". [74] A strict partial order is a relation that is irreflexive, anti-symmetric, and transitive, like the relation being less than expressed through the symbol "<". [75]

  6. Relation (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Relation_(mathematics)

    In mathematics, a relation denotes some kind of relationship between two objects in a set, which may or may not hold. [ 1 ] As an example, " is less than " is a relation on the set of natural numbers; it holds, for instance, between the values 1 and 3 (denoted as 1 < 3), and likewise between 3 and 4 (denoted as 3 < 4), but not between the ...

  7. Partially ordered set - Wikipedia

    en.wikipedia.org/wiki/Partially_ordered_set

    Partial orders. A reflexive, weak, [1] or non-strict partial order, [2] commonly referred to simply as a partial order, is a homogeneous relation ≤ on a set that is reflexive, antisymmetric, and transitive. That is, for all it must satisfy: Reflexivity: , i.e. every element is related to itself.

  8. Binary relation - Wikipedia

    en.wikipedia.org/wiki/Binary_relation

    A partial order is a relation that is reflexive, antisymmetric, and transitive. A strict partial order is a relation that is irreflexive, asymmetric, and transitive. A total order is a relation that is reflexive, antisymmetric, transitive and connected. [37] A strict total order is a relation that is irreflexive, asymmetric, transitive and ...

  9. Symmetric relation - Wikipedia

    en.wikipedia.org/wiki/Symmetric_relation

    A symmetric relation is a type of binary relation. Formally, a binary relation R over a set X is symmetric if: [1] where the notation aRb means that (a, b) ∈ R. An example is the relation "is equal to", because if a = b is true then b = a is also true. If RT represents the converse of R, then R is symmetric if and only if R = RT.