Примеры использования A functor на Английском языке и их переводы на Русский язык
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It can be seen as a functor in two arguments.
A functor with a left and a right adjoint.
Every functor F:D→ E induces a functor FC: DC→ EC by composition with F.
A functor to the comma category selects that particular collection of morphisms.
Then S can be seen as a(left)R-module, and the tensor product with S yields a functor F: R-Mod→ S-Mod.
A functor whose domain is a product category is known as a bifunctor.
If R is a ring and M is a right R-module,then the tensor product with M yields a functor F: R-Mod→ Ab.
Due to this circumstance, a functor with these properties is sometimes called a weak equivalence of categories.
In mathematics, specifically in category theory,an F{\displaystyle F}-coalgebra is a structure defined according to a functor F{\displaystyle F.
Note that a functor of the form Hom(-,A): Cop→ Set is a presheaf; likewise, Hom(A,-) is a copresheaf.
In mathematics, particularly category theory, a representable functor is a functor of a special form from an arbitrary category into the category of sets.
A functor G: C→ D is said to lift limits for a diagram F: J→ C if whenever(L, φ) is a limit of GF there exists a limit(L′, φ′) of F such that G(L′, φ′) L, φ.
In the language of category theory, one says that there is a functor T from the category of K-vector spaces to the category of K-associate algebras.
Let G: D→ C be a functor and let X be an object of C. Then(A, φ) is a universal morphism from X to G if and only if(A, φ) is a representation of the functor HomC(X, G-) from D to Set.
Given two categories C and D,an equivalence of categories consists of a functor F: C→ D, a functor G: D→ C, and two natural isomorphisms ε: FG→ID and η: IC→GF.
Of course, various things have to be checked: the end result does not depend on the given injective resolution of X, and any morphism X→ Y naturally yields a morphism RiF(X)→ RiF(Y), so thatwe indeed obtain a functor.
The essential point is to fix a topological space X andthink of cohomology as a functor from sheaves of abelian groups on X to abelian groups.
The formulation of the group of units defines a functor U from the category of rings to the category of groups: every ring homomorphism f: R→ S induces a group homomorphism U(f): U(R)→ U(S), since f maps units to units.
But it turns out that(if A is"nice" enough)there is one canonical way of doing so, given by the right derived functors of F. For every i≥1, there is a functor RiF: A→ B, and the above sequence continues like so: 0→ F(A)→ F(B)→ F(C)→ R1F(A)→ R1F(B)→ R1F(C)→ R2F(A)→ R2F(B)→.
A functor G is said to preserve all limits of shape J if it preserves the limits of all diagrams F: J→ C. For example, one can say that G preserves products, equalizers, pullbacks, etc. A continuous functor is one that preserves all small limits.
This statement is an initial property of the tensor algebra since it expresses the fact that the pair(T(V), i), where i: V→ U(T(V)) is the inclusion map, is an initial morphism from the vector space V to thefunctor U. Since this construction works for any vector space V, we conclude that T is a functor from K-Vect to K-Alg.
For a scheme X of finite type over C,there is a functor from coherent algebraic sheaves on X to coherent analytic sheaves on the associated analytic space Xan.
The category of pointed sets is a commacategory,(∙↓ S e t){\displaystyle\scriptstyle{(\bullet\downarrow\mathbf{Set})}} with∙{\displaystyle\scriptstyle{\bullet}} being(a functor selecting) any singleton set, and S e t{\displaystyle\scriptstyle{\mathbf{Set}}}(the identity functor of) the category of sets.
The map X↦ C X{\displaystyle X\mapsto CX}induces a functor C: T o p→ T o p{\displaystyle C:\mathbf{Top}\to\mathbf{Top}} on the category of topological spaces Top.
In category theory, a faithful functor(respectively a full functor) is a functor that is injective(respectively surjective) when restricted to each set of morphisms that have a given source and target.
In other words, there is a contravariant functor that gives an equivalence between the categories.
This forgetful functor is right adjoint to the functor sending a quiver to the corresponding free category.