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  2. Total order - Wikipedia

    en.wikipedia.org/wiki/Total_order

    In mathematics, a total order or linear order is a partial order in which any two elements are comparable. That is, a total order is a binary relation ≤ {\displaystyle \leq } on some set X {\displaystyle X} , which satisfies the following for all a , b {\displaystyle a,b} and c {\displaystyle c} in X {\displaystyle X} :

  3. Relation (mathematics) - Wikipedia

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

    A relation that is functional and total. For example, the red and green relations in the diagram are functions, but the blue and black ones are not. An injection [d] A function that is injective. For example, the green relation in the diagram is an injection, but the red, blue and black ones are not. A surjection [d] A function that is surjective.

  4. Glossary of order theory - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_order_theory

    Total order. A total order T is a partial order in which, for each x and y in T, we have x ≤ y or y ≤ x. Total orders are also called linear orders or chains. Total relation. Synonym for Connected relation. Transitive relation. A relation R on a set X is transitive, if x R y and y R z imply x R z, for all elements x, y, z in X. Transitive ...

  5. Order theory - Wikipedia

    en.wikipedia.org/wiki/Order_theory

    Order theory is a branch of mathematics that investigates the intuitive notion of order using binary relations. It provides a formal framework for describing statements such as "this is less than that" or "this precedes that".

  6. Ordered field - Wikipedia

    en.wikipedia.org/wiki/Ordered_field

    The definition of total order appeared first historically and is a first-order axiomatization of the ordering as a binary predicate. Artin and Schreier gave the definition in terms of positive cone in 1926, which axiomatizes the subcollection of nonnegative elements.

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  8. Szpilrajn extension theorem - Wikipedia

    en.wikipedia.org/wiki/Szpilrajn_Extension_Theorem

    A partial order is, by definition, a reflexive, transitive and antisymmetric relation. A total order is a partial order that is connex. A relation R {\displaystyle R} is contained in another relation S {\displaystyle S} when all ordered pairs in R {\displaystyle R} also appear in S ; {\displaystyle S;} that is, x R y {\displaystyle xRy} implies ...

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