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adjoun
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The answer ADJOUN has 1 possible clue(s) in existing crosswords.
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Definitions of adjoun in various dictionaries:
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Possible Crossword Clues |
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Take a break from a meeting or gathering |
Last Seen in these Crosswords & Puzzles |
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Apr 24 2000 Irish Times (Simplex) |
Adjoun might refer to |
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In mathematics, specifically category theory, adjunction is a relationship that two functors may have. Two functors that stand in this relationship are known as Adjoint functors, one being the left adjoint and the other the right adjoint. Pairs of adjoint functors are ubiquitous in mathematics and often arise from constructions of "optimal solutions" to certain problems (i.e., constructions of objects having a certain universal property), such as the construction of a free group on a set in algebra, or the construction of the Stone-Čech compactification of a topological space in topology. * By definition, an adjunction between categories C and D is a pair of functors (assumed to be covariant)* * * * F * : * * * D * * * → * * * C * * * * * {\displaystyle F:{\mathcal {D}}\rightarrow {\mathcal {C}}} * and * * * * G * : * * * C * * * → * * * D * * * * * {\displaystyle G:{\mathcal {C}}\rightarrow {\mathcal {D}}} * and, for all objects X in C and Y in D a bijection between the respective morphism sets * * * * * * * h * o * m * * * * C * * * * ( * F * Y * , * X * ) * ≅ * * * h * o * m * * * * D * * * * ( * Y * , * G * X * ) * * * {\displaystyle \mathrm {hom} _{\mathcal {C}}(FY,X)\cong \mathrm {hom} _{\mathcal {D}}(Y,GX)} * such that this family of bijections is natural in X and Y. The functor F is called a left adjoint functor or left adjoint to G , while G is called a right adjoint functor or right adjoint to F . * An adjunction between categories C and D is somewhat akin to a "weak form" of an equivalence between C and D, and indeed every equivalence is an adjunction. In many situations, an adjunction can be "upgraded" to an equivalence, by a suitable natural modification of the involved categories and functors. |