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  2. Duality (mathematics) - Wikipedia

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

    A duality that respects the orderings in question is known as a Galois connection. An example is the standard duality in Galois theory mentioned in the introduction: a bigger field extension corresponds—under the mapping that assigns to any extension L ⊃ K (inside some fixed bigger field Ω) the Galois group Gal (Ω / L) —to a smaller ...

  3. Dilworth's theorem - Wikipedia

    en.wikipedia.org/wiki/Dilworth's_theorem

    In mathematics, in the areas of order theory and combinatorics, Dilworth's theorem states that, in any finite partially ordered set, the maximum size of an antichain of incomparable elements equals the minimum number of chains needed to cover all elements.

  4. Frobenius reciprocity - Wikipedia

    en.wikipedia.org/wiki/Frobenius_reciprocity

    In mathematics, and in particular representation theory, Frobenius reciprocity is a theorem expressing a duality between the process of restricting and inducting.It can be used to leverage knowledge about representations of a subgroup to find and classify representations of "large" groups that contain them.

  5. Conjunction/disjunction duality - Wikipedia

    en.wikipedia.org/.../Conjunction/disjunction_duality

    In propositional logic and Boolean algebra, there is a duality between conjunction and disjunction, [1] [2] [3] also called the duality principle. [ 4 ] [ 5 ] [ 6 ] It is the most widely known example of duality in logic. [ 1 ]

  6. Duality (order theory) - Wikipedia

    en.wikipedia.org/wiki/Duality_(order_theory)

    In the mathematical area of order theory, every partially ordered set P gives rise to a dual (or opposite) partially ordered set which is often denoted by P op or P d.This dual order P op is defined to be the same set, but with the inverse order, i.e. x ≤ y holds in P op if and only if y ≤ x holds in P.

  7. Dual (category theory) - Wikipedia

    en.wikipedia.org/wiki/Dual_(category_theory)

    In category theory, a branch of mathematics, duality is a correspondence between the properties of a category C and the dual properties of the opposite category C op.Given a statement regarding the category C, by interchanging the source and target of each morphism as well as interchanging the order of composing two morphisms, a corresponding dual statement is obtained regarding the opposite ...

  8. Dual linear program - Wikipedia

    en.wikipedia.org/wiki/Dual_linear_program

    The strong duality theorem says that if one of the two problems has an optimal solution, so does the other one and that the bounds given by the weak duality theorem are tight, i.e.: max x c T x = min y b T y. The strong duality theorem is harder to prove; the proofs usually use the weak duality theorem as a sub-routine.

  9. Bregman divergence - Wikipedia

    en.wikipedia.org/wiki/Bregman_divergence

    Duality: If F is strictly convex, then the function F has a convex conjugate which is also strictly convex and continuously differentiable on some convex set . The Bregman distance defined with respect to F ∗ {\displaystyle F^{*}} is dual to D F ( p , q ) {\displaystyle D_{F}(p,q)} as

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