Examples of using Functors in English and their translations into Chinese
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We have two functors.
Finally, the STL includes a large collection of function objects,also known as functors.
Java made you use functors, which is even uglier.
Morphisms in that category are functors.
If F and G are contravariant functors one speaks of a duality of categories instead.
Suppose we have two natural transformations, α and β, that act,respectively, on functors F and G:.
F is a left adjoint of G and both functors are full and faithful.
Categories, functors and natural transformations were introduced by Samuel Eilenberg and Saunders MacLane in 1945.
Suppose we have two functors and.
With a judicious choice of functors, a lot of these commutativity conditions may be transformed into naturality conditions.
F is a left adjoint of G and both functors are full and faithful.
Functors often describe"natural constructions" and natural transformations then describe"natural homomorphisms" between two such constructions.
G is a right adjoint of F and both functors are full and faithful.
Functors in Haskell are from Hask to func, where func is the subcategory of Hask defined on just that functor's types.
Instances of those classes are called functors or function objects.
Container types(and algorithms, functors and all STL as well) are defined not in global namespace, but in special namespace called“std.”.
These isomorphisms are"natural" in thesense that they define a natural transformation between the two involved functors Abop x Abop x Ab-gt; Ab.
The narrative function is losing its functors, its great hero, its great dangers, its great voyages, its great goal.".
Since all standard algebraic data types are functors, any polymorphic function between such types is a natural transformation.
Then Alexander Grothendieck used derived functors of the global section functor, providing a more definitive solution.
Now that we have mappings between functors- natural transformations- it's only natural to ask the question whether functors form a category.
A functor which is both faithful and full is called fully faithful.
A functor maps a category to another category.
And satisfies the functor laws:.
A functor from a category to itself is called an endofunctor.
A functor also maps morphisms, so it is a higher order function- fmap.
The quickest way to define a contravariant functor is as a covariant functor from the opposite category Cop to D.
Pluck will work on any functor in addition to arrays, as it is equivalent to R. map(R. prop(k), f).