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Quotient space of a codomain of a linear map by the map's image
The cokernel of a linear mapping of vector spaces f : X → Y is the quotient space Y / im(f) of the codomain of f by the image of f. The dimension of the
Cokernel
Theorem in homological algebra
zero object. Then there is an exact sequence relating the kernels and cokernels of a, b, and c: ker ( f ) ⟶ ker a ⟶ ker b ⟶ ker c
Snake_lemma
Complementary of a rank
the dimension of the left nullspace of a matrix, the dimension of the cokernel of a linear transformation of a vector space, or the number of elements
Corank
Category with direct sums and certain types of kernels and cokernels
in which morphisms and objects can be added and in which kernels and cokernels exist and have desirable properties. The motivating prototypical example
Abelian_category
Category
pre-abelian category is an additive category that has all kernels and cokernels. Spelled out in more detail, this means that a category C is pre-abelian
Pre-abelian_category
Tool in homological algebra
theory of triangulated categories it is a kind of combined kernel and cokernel: if the chain complexes take their terms in an abelian category, so that
Mapping cone (homological algebra)
Mapping_cone_(homological_algebra)
is again a kernel and, dually, the pullback of a cokernel along arbitrary morphisms is again a cokernel. A quasi-abelian category is an exact category.[citation
Quasi-abelian_category
Mathematical category whose hom sets form Abelian groups
exist morphisms without kernels and/or cokernels. There is a convenient relationship between the kernel and cokernel and the abelian group structure on the
Preadditive_category
Generalization of the kernel of a homomorphism
The dual concept to that of kernel is that of cokernel. That is, the kernel of a morphism is its cokernel in the opposite category, and vice versa. As
Kernel_(category_theory)
Type of morphism
the kernel of some morphism, and an epimorphism is conormal if it is the cokernel of some morphism. A category C is binormal if it's both normal and conormal
Normal_morphism
Mathematical function, in linear algebra
invariant of a linear transformation f : V → W {\textstyle f:V\to W} is the cokernel, which is defined as coker ( f ) := W / f ( V ) = W / im ( f ) . {\displaystyle
Linear_map
Set of eigenvalues of a matrix
operator is semi-Fredholm if its range is closed and either its kernel or cokernel (or both) is finite-dimensional.) Example 1: λ = 0 ∈ σ e s s , 1 ( A )
Spectrum (functional analysis)
Spectrum_(functional_analysis)
Aspect of category theory
particularly simple. It is just the factor group Y / im(f – g). (This is the cokernel of the morphism f – g; see the next section). In the category of topological
Coequalizer
defined as the equalizer ( I m , m ) {\displaystyle (Im,m)} of the so-called cokernel pair ( Y ⊔ X Y , i 1 , i 2 ) {\displaystyle (Y\sqcup _{X}Y,i_{1},i_{2})}
Image_(category_theory)
Mathematical result in differential geometry
the kernel of D (solutions of Df = 0), and the (finite) dimension of the cokernel of D (the constraints on the right-hand-side of an inhomogeneous equation
Atiyah–Singer_index_theorem
Part of Fredholm theories in integral equations
kernel ker T {\displaystyle \ker T} and finite-dimensional (algebraic) cokernel coker T = Y / ran T {\displaystyle \operatorname {coker} T=Y/\operatorname
Fredholm_operator
Applications of category theory
Pullbacks Inverse limit Colimits Initial objects Coproducts Coequalizers Cokernels and quotients Pushout Direct limit Algebraic categories Sets Relations
Applied_category_theory
Elements taken to zero by a homomorphism
homomorphism has a kernel and cokernel, every monomorphism is the kernel of its cokernel, and every epimorphism is the cokernel of its kernel. Kernels of
Kernel_(algebra)
Vectors mapped to 0 by a linear map
\operatorname {rank} (A)+\operatorname {nullity} (A)=n.} The left null space, or cokernel, of a matrix A consists of all column vectors x such that xTA = 0T, where
Kernel_(linear_algebra)
Whether a manifold which is a homotopy sphere is a sphere
r ( J n ) ≡ c o k e r n e l ( J n ) {\displaystyle coker(J_{n})\equiv cokernel(J_{n})} . The remaining term in the short exact sequence, namely the group
Generalized Poincaré conjecture
Generalized_Poincaré_conjecture
Mathematical object that generalizes the standard notions of sets and functions
additive category. If all morphisms have a kernel and a cokernel, and all epimorphisms are cokernels and all monomorphisms are kernels, then we speak of an
Category_(mathematics)
General theory of mathematical structures
Pullbacks Inverse limit Colimits Initial objects Coproducts Coequalizers Cokernels and quotients Pushout Direct limit Algebraic categories Sets Relations
Category_theory
Concept in mathematics
Pullbacks Inverse limit Colimits Initial objects Coproducts Coequalizers Cokernels and quotients Pushout Direct limit Algebraic categories Sets Relations
Tensor–hom_adjunction
In algebra, a module over a ring
can be visualized as an (infinite) matrix with entries in R and M as its cokernel. A free presentation always exists: any module is a quotient of a free
Free_presentation
constructed as a localization of A by the class of morphisms whose kernel and cokernel are both in B. An isogeny from an abelian variety A to another one B is
Localization_of_a_category
p=p} . Elementary considerations show that every idempotent then has a cokernel. The pseudo-abelian condition is stronger than preadditivity, but it is
Pseudo-abelian_category
Sequence of homomorphisms such that each kernel equals the preceding image
notion of an exact sequence makes sense in any category with kernels and cokernels, and more specially in abelian categories, where it is widely used. To
Exact_sequence
transformation from the kernel of some primary cohomology operation to the cokernel of another primary operation. They were introduced by J. Frank Adams (1960)
Secondary cohomology operation
Secondary_cohomology_operation
Generalization of vector bundles
they are closed under operations such as taking kernels, images, and cokernels. The quasi-coherent sheaves are a generalization of coherent sheaves and
Coherent_sheaf
In mathematics, invertible homomorphism
Pullbacks Inverse limit Colimits Initial objects Coproducts Coequalizers Cokernels and quotients Pushout Direct limit Algebraic categories Sets Relations
Isomorphism
Embedding of categories into functor categories
Pullbacks Inverse limit Colimits Initial objects Coproducts Coequalizers Cokernels and quotients Pushout Direct limit Algebraic categories Sets Relations
Yoneda_lemma
Relationship between two functors abstracting many common constructions
that the cokernel functors for abelian groups, vector spaces and modules are left adjoints. Coproducts, pushouts, coequalizers, and cokernels are all examples
Adjoint_functors
Category admitting tensor products
Pullbacks Inverse limit Colimits Initial objects Coproducts Coequalizers Cokernels and quotients Pushout Direct limit Algebraic categories Sets Relations
Monoidal_category
Topics referred to by the same term
linear map, the dimension of the map's kernel minus the dimension of its cokernel Index of a matrix Index of a real quadratic form Index, the winding number
Index
Most general completion of a commutative square given two morphisms with same codomain
Pullbacks Inverse limit Colimits Initial objects Coproducts Coequalizers Cokernels and quotients Pushout Direct limit Algebraic categories Sets Relations
Pullback_(category_theory)
Mathematical construction used in homotopy theory
Pullbacks Inverse limit Colimits Initial objects Coproducts Coequalizers Cokernels and quotients Pushout Direct limit Algebraic categories Sets Relations
Simplicial_set
Relation of categories in category theory
Pullbacks Inverse limit Colimits Initial objects Coproducts Coequalizers Cokernels and quotients Pushout Direct limit Algebraic categories Sets Relations
Isomorphism_of_categories
Vector space consisting of affine subsets
(the nullity of T) plus the dimension of the image (the rank of T). The cokernel of a linear operator T : V → W is defined to be the quotient space W/im(T)
Quotient space (linear algebra)
Quotient_space_(linear_algebra)
In number theory, measure of non-unique factorization
homomorphism; its kernel is the group of units of R {\displaystyle R} , and its cokernel is the ideal class group of R {\displaystyle R} . The failure of these
Ideal_class_group
Matrix decomposition
singular value 0 {\displaystyle 0} comprise all unit vectors in the cokernel and kernel, respectively, of M {\displaystyle \mathbf {M} } . By the
Singular_value_decomposition
Mapping between categories
Pullbacks Inverse limit Colimits Initial objects Coproducts Coequalizers Cokernels and quotients Pushout Direct limit Algebraic categories Sets Relations
Functor
Pullbacks Inverse limit Colimits Initial objects Coproducts Coequalizers Cokernels and quotients Pushout Direct limit Algebraic categories Sets Relations
N-group_(category_theory)
Injective homomorphism
Pullbacks Inverse limit Colimits Initial objects Coproducts Coequalizers Cokernels and quotients Pushout Direct limit Algebraic categories Sets Relations
Monomorphism
Set of elements that commute with every element of a group
Inn(G). By the first isomorphism theorem we get, G/Z(G) ≃ Inn(G). The cokernel of this map is the group Out(G) of outer automorphisms, and these form
Center_(group_theory)
Most general completion of a commutative square given two morphisms with same domain
B ⊔C A. In an abelian category all pushouts exist, and they preserve cokernels in the following sense: if (P, i1, i2) is the pushout of f : Z → X and
Pushout_(category_theory)
Generalization of category
Pullbacks Inverse limit Colimits Initial objects Coproducts Coequalizers Cokernels and quotients Pushout Direct limit Algebraic categories Sets Relations
2-category
Special objects used in (mathematical) category theory
Pullbacks Inverse limit Colimits Initial objects Coproducts Coequalizers Cokernels and quotients Pushout Direct limit Algebraic categories Sets Relations
Initial_and_terminal_objects
Overview of and topical guide to category theory
theory)/fiber product Inverse limit Pro-finite group Colimit Coproduct Coequalizer Cokernel Pushout (category theory) Direct limit Biproduct Direct sum Preadditive
Outline_of_category_theory
Abelian categories, while abstractly defined, are in fact concrete categories of modules
of R-Mod in such a way that kernels and cokernels computed in A correspond to the ordinary kernels and cokernels computed in R-Mod. Such an equivalence
Mitchell's_embedding_theorem
Theorem in category theory
Pullbacks Inverse limit Colimits Initial objects Coproducts Coequalizers Cokernels and quotients Pushout Direct limit Algebraic categories Sets Relations
Lawvere's_fixed-point_theorem
Type of quotient object in mathematics
Pullbacks Inverse limit Colimits Initial objects Coproducts Coequalizers Cokernels and quotients Pushout Direct limit Algebraic categories Sets Relations
Quotient_category
Abstract mathematics relationship
equalizers, products and coproducts among others. Applying it to kernels and cokernels, we see that the equivalence F is an exact functor. C is a cartesian closed
Equivalence_of_categories
Set of arguments where two or more functions have the same value
Pullbacks Inverse limit Colimits Initial objects Coproducts Coequalizers Cokernels and quotients Pushout Direct limit Algebraic categories Sets Relations
Equaliser_(mathematics)
Mathematical structures in category theory
Pullbacks Inverse limit Colimits Initial objects Coproducts Coequalizers Cokernels and quotients Pushout Direct limit Algebraic categories Sets Relations
Functor_category
Pullbacks Inverse limit Colimits Initial objects Coproducts Coequalizers Cokernels and quotients Pushout Direct limit Algebraic categories Sets Relations
Tetracategory
Eigenvector with vanishing eigenvalue
circle. The kernel of an operator consists of left zero modes, and the cokernel consists of the right zero modes. Vaughn, Michael T. (2008). Introduction
Zero_mode
Pullbacks Inverse limit Colimits Initial objects Coproducts Coequalizers Cokernels and quotients Pushout Direct limit Algebraic categories Sets Relations
Refinement_(category_theory)
Tool to track locally defined data attached to the open sets of a topological space
projective limits commute with projective limits. On the other hand, the cokernel is not always a sheaf because inductive limits do not necessarily commute
Sheaf_(mathematics)
Homological algebra is the study of homological functors
complexes, which can be studied through their homology and cohomology. Cokernel Exact sequence Chain complex Differential module Five lemma Short five
List of homological algebra topics
List_of_homological_algebra_topics
Topics referred to by the same term
category in which every monomorphism is a kernel and every epimorphism is a cokernel Abelian and Tauberian theorems, in real analysis, used in the summation
Abelian
Type of category in category theory
category is an additive category in which every morphism has a kernel and a cokernel. An abelian category is a pre-abelian category such that every monomorphism
Additive_category
Map (arrow) between two objects of a category
Pullbacks Inverse limit Colimits Initial objects Coproducts Coequalizers Cokernels and quotients Pushout Direct limit Algebraic categories Sets Relations
Morphism
Branch of mathematics
restricts oneself to finitely generated modules. However, every module is a cokernel of a homomorphism of free modules. Modules over the integers can be identified
Linear_algebra
Mathematical concept
categories. Coequalizers are colimits of a parallel pair of morphisms. Cokernels are coequalizers of a morphism and a parallel zero morphism. Pushouts
Limit_(category_theory)
Sequence of terms related to the first step of a spectral sequence
of H 1(A) by the first subgroup in the filtration, and hence it is the cokernel of the edge map from E21,0. This yields a short exact sequence 0 → E21
Five-term_exact_sequence
Then Ω − 1 ( M ) {\displaystyle \Omega ^{-1}(M)} is defined to be the cokernel of i. A case of particular interest is when the ring R is a group algebra
Stable_module_category
Mathematics construct
Pullbacks Inverse limit Colimits Initial objects Coproducts Coequalizers Cokernels and quotients Pushout Direct limit Algebraic categories Sets Relations
Comma_category
Special case of colimit in category theory
Pullbacks Inverse limit Colimits Initial objects Coproducts Coequalizers Cokernels and quotients Pushout Direct limit Algebraic categories Sets Relations
Direct_limit
closure. CLT – central limit theorem. cod, codom – codomain. cok, coker – cokernel. colsp – column space of a matrix. conv – convex hull of a set. Cor – corollary
List of mathematical abbreviations
List_of_mathematical_abbreviations
categories without requiring that morphisms actually possess kernels and cokernels, which is necessary for the usual definition of such a sequence. An exact
Exact_category
Mathematical category
Pullbacks Inverse limit Colimits Initial objects Coproducts Coequalizers Cokernels and quotients Pushout Direct limit Algebraic categories Sets Relations
Topos
Pullbacks Inverse limit Colimits Initial objects Coproducts Coequalizers Cokernels and quotients Pushout Direct limit Algebraic categories Sets Relations
Fundamental_groupoid
Pullbacks Inverse limit Colimits Initial objects Coproducts Coequalizers Cokernels and quotients Pushout Direct limit Algebraic categories Sets Relations
Free_category
Surjective homomorphism
in the definition of coequalizers. It follows in particular that every cokernel is an epimorphism. The converse, namely that every epimorphism be a coequalizer
Epimorphism
Aspect of mathematical spectrum theory
x\in X} . (An operator is Fredholm if it is bounded, and its kernel and cokernel are finite-dimensional.) The definition of essential spectrum σ e s s (
Essential_spectrum
About direct sums and exact sequences
that: C ≅ B/ker r ≅ B/q(A) (i.e., C isomorphic to the coimage of r or cokernel of q) to: B = q(A) ⊕ u(C) ≅ A ⊕ C where the first isomorphism theorem is
Splitting_lemma
Pullbacks Inverse limit Colimits Initial objects Coproducts Coequalizers Cokernels and quotients Pushout Direct limit Algebraic categories Sets Relations
Diagonal_functor
Difference between the dimensions of mathematical object and a sub-object
infinite) of the quotient space V/W, which is more abstractly known as the cokernel of the inclusion. For finite-dimensional vector spaces, this agrees with
Codimension
Difference between two dimensions
fiber. More abstractly, the codimension of a map is the dimension of the cokernel, while the relative dimension of a map is the dimension of the kernel.
Relative_dimension
Bi-universal property in category theory
category has zero morphisms, then one can define the notions of kernel and cokernel for any morphism in that category. Section 1.7 of Pareigis, Bodo (1970)
Zero_morphism
Functor that preserves short exact sequences
"F turns cokernels into cokernels"); G is left-exact if and only if A→B→C→0 exact implies 0→G(C)→G(B)→G(A) exact (i.e. if "G turns cokernels into kernels");
Exact_functor
Type of category in category theory
Pullbacks Inverse limit Colimits Initial objects Coproducts Coequalizers Cokernels and quotients Pushout Direct limit Algebraic categories Sets Relations
Cartesian_closed_category
Mathematical group
G → Aut(G). The kernel of the conjugation map is the center, while the cokernel is the outer automorphism group (and the image is the inner automorphism
Outer_automorphism_group
In linear algebra, relation between 3 dimensions
T {\displaystyle T} is considered alongside its image and kernel: the cokernel of T {\displaystyle T} is the quotient space W / Im ( T ) {\displaystyle
Rank–nullity_theorem
module whose finitely generated submodules are finitely presented. cokernel The cokernel of a module homomorphism is the codomain quotiented by the image
Glossary_of_module_theory
Concept in category theory
Pullbacks Inverse limit Colimits Initial objects Coproducts Coequalizers Cokernels and quotients Pushout Direct limit Algebraic categories Sets Relations
Monoidal_functor
transpose Tr(M) of a left Λ-module M is a right Λ-module defined to be the cokernel of the map Q* → P*, where P → Q → M → 0 is a minimal projective presentation
Artin_algebra
German scientist and mathematician (1884–1941)
of such an operator, giving an example of an operator whose kernel and cokernel have different finite dimension and providing a formula for the difference
Fritz_Noether
Category whose objects are abelian groups and whose morphisms are group homomorphisms
homomorphism i : K → A {\displaystyle i:K\to A} . The same is true for cokernels; the cokernel of f is the quotient group C = B / f ( A ) {\displaystyle C=B/f(A)}
Category_of_abelian_groups
Generalized object in category theory
Pullbacks Inverse limit Colimits Initial objects Coproducts Coequalizers Cokernels and quotients Pushout Direct limit Algebraic categories Sets Relations
Product_(category_theory)
Pullbacks Inverse limit Colimits Initial objects Coproducts Coequalizers Cokernels and quotients Pushout Direct limit Algebraic categories Sets Relations
Essentially surjective functor
Essentially_surjective_functor
Hypothesis in mathematical category theory
Pullbacks Inverse limit Colimits Initial objects Coproducts Coequalizers Cokernels and quotients Pushout Direct limit Algebraic categories Sets Relations
Homotopy_hypothesis
Concept in category theory (in mathematics)
z} and f z = f c ∘ h {\displaystyle f_{z}=f_{c}\circ h} Quotient object Cokernel Mitchell, Barry (1965). Theory of categories. Pure and applied mathematics
Coimage
Algebra of formal sums
understood as a quotient of a free abelian group by "relations", or as a cokernel of an injective homomorphism between free abelian groups. The only free
Free_abelian_group
Commutative group (mathematics)
generator of the kernel. Then, the abelian group is isomorphic to the cokernel of linear map defined by M. Conversely every integer matrix defines a finitely
Abelian_group
Pullbacks Inverse limit Colimits Initial objects Coproducts Coequalizers Cokernels and quotients Pushout Direct limit Algebraic categories Sets Relations
Lift_(mathematics)
Characterizing property of mathematical constructions
compactification, tensor products, inverse limit and direct limit, kernels and cokernels, quotient groups, quotient vector spaces, and other quotient spaces. Before
Universal_property
Branch of mathematics
notion of an exact sequence makes sense in any category with kernels and cokernels. The most common type of exact sequence is the short exact sequence. This
Homological_algebra
Mathematical operation on vector spaces
\qquad a_{ij}\in R,} the tensor product can be computed as the following cokernel: M ⊗ R N = coker ( N J → N I ) {\displaystyle M\otimes _{R}N=\operatorname
Tensor_product
Typically linear operator defined in terms of differentiation of functions
theory that P is a Fredholm operator: it has finite-dimensional kernel and cokernel. In the study of hyperbolic and parabolic partial differential equations
Differential_operator
COKERNEL
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Boy/Male
Indian, Sanskrit
Abode of Light
Surname or Lastname
English
English : habitational name from a place in Derbyshire named Wheeldon, from Old English hwēol ‘wheel’ (referring perhaps to a rounded shape) + dūn ‘hill’, or from Whielden in Buckinghamshire, which is named with hwēol + denu ‘valley’.
Boy/Male
Tamil
Confluence of Ganga Jamuna Saraswati
Boy/Male
Indian, Sanskrit
Lord of the Day; Lord Indra
Boy/Male
Indian, Sanskrit
Celestial
Girl/Female
Tamil
Arnika | à®…à®°à¯à®¨à®¿à®•à®¾
Goddess Durga
Girl/Female
Hindu
A Shakti of Ganesh, Auspicious, Causing victory
Surname or Lastname
English
English : unexplained.Variant of Dutch Hiers.
Boy/Male
Indian
Eternal, Immortal, One of ninety nine names of God
Girl/Female
Tamil
Amrit or nectar or pure water, Part of God
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