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  2. Partially ordered set - Wikipedia

    en.wikipedia.org/wiki/Partially_ordered_set

    Conversely, a strict partial order < on may be converted to a non-strict partial order by adjoining all relationships of that form; that is, := < is a non-strict partial order. Thus, if ≤ {\displaystyle \leq } is a non-strict partial order, then the corresponding strict partial order < is the irreflexive kernel given by a < b if a ≤ b and a ...

  3. ∂ - Wikipedia

    en.wikipedia.org/wiki/%E2%88%82

    The symbol was introduced originally in 1770 by Nicolas de Condorcet, who used it for a partial differential, and adopted for the partial derivative by Adrien-Marie Legendre in 1786. [3] It represents a specialized cursive type of the letter d , just as the integral sign originates as a specialized type of a long s (first used in print by ...

  4. Order theory - Wikipedia

    en.wikipedia.org/wiki/Order_theory

    Order theory is a branch of mathematics that investigates the ... Then ≤ is a partial order if it is ... meanings for the relation symbol ≤ in this definition.)

  5. Glossary of mathematical symbols - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_mathematical...

    A mathematical symbol is a figure or a combination of figures that is used to represent a mathematical object, an action on mathematical objects, a relation between mathematical objects, or for structuring the other symbols that occur in a formula. As formulas are entirely constituted with symbols of various types, many symbols are needed for ...

  6. Lattice (order) - Wikipedia

    en.wikipedia.org/wiki/Lattice_(order)

    A lattice is an abstract structure studied in the mathematical subdisciplines of order theory and abstract algebra.It consists of a partially ordered set in which every pair of elements has a unique supremum (also called a least upper bound or join) and a unique infimum (also called a greatest lower bound or meet).

  7. Preorder - Wikipedia

    en.wikipedia.org/wiki/Preorder

    The relation on equivalence classes is a partial order. In mathematics, ... with its own special symbol ... get the definition of a strict partial order on ...

  8. Partial derivative - Wikipedia

    en.wikipedia.org/wiki/Partial_derivative

    One of the first known uses of this symbol in mathematics is by Marquis de Condorcet from 1770, [1] who used it for partial differences. The modern partial derivative notation was created by Adrien-Marie Legendre (1786), although he later abandoned it; Carl Gustav Jacob Jacobi reintroduced the symbol in 1841.

  9. Order (mathematics) - Wikipedia

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

    Order theory, study of various binary relations known as orders; Order topology, a topology of total order for totally ordered sets; Ordinal numbers, numbers assigned to sets based on their set-theoretic order; Partial order, often called just "order" in order theory texts, a transitive antisymmetric relation