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2142:
Jiri Adamek, Horst
Herrlich, George Strecker. Abstract and concrete categories: The joy of cats, Chapter 9, Injective Objects and Essential Embeddings,
54:
1043:
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to this sequence and computing the homology of the resulting (not necessarily exact) sequence. This approach is used to define
526:
517:
1236:
2055:
76:
47:
2128:. Reprints in Theory and Applications of Categories, No. 17 (2006) pp. 1-507. orig. John Wiley. pp. 147–155.
2119:
Adamek, Jiri; Herrlich, Horst; Strecker, George (1990). "Sec. 9. Injective objects and essential embeddings".
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Republished in
Reprints and Applications of Categories, No. 17 (2006) pp. 1-507
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in the above definition is not required to be uniquely determined by
1196:
993:
257:
608:, and this is still one of its primary areas of application. When
1575:, we are back to the injective objects that were treated above.
899:
1104:{\displaystyle 0\to X\to Q^{0}\to Q^{1}\to Q^{2}\to \cdots }
927:. Assuming the axiom of choice, the notions are equivalent.
1029:
If an abelian category has enough injectives, we can form
762:
563:{\displaystyle \operatorname {Hom} _{\mathbf {C} }(-,Q)}
2118:
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2031:
1986:
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895:. The injective hull is then uniquely determined by
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604:The notion of injectivity was first formulated for
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1996:
1979:, the injective objects with respect to the class
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1103:
985:, and the injective hull of a metric space is its
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2149:J. Rosicky, Injectivity and accessible categories
2122:Abstract and Concrete Categories: The Joy of Cats
2161:
46:but its sources remain unclear because it lacks
2156:-reflection and injective hulls of fibre spaces
520:category, it is equivalent to require that the
1150:. The categories being used are typically
2024:form the injective objects for the class
875:is an essential monomorphism with domain
77:Learn how and when to remove this message
1195:
599:
128:
923:, an injective object is necessarily a
2162:
137:is injective if, given a monomorphism
101:is a generalization of the concept of
16:Mathematical object in category theory
763:Enough injectives and injective hulls
718:{\displaystyle 0\to Q\to U\to V\to 0}
2114:
2112:
2110:
18:
819:, there exists a monomorphism from
424:factors through every monomorphism
13:
2068:
2058:of a partially ordered set is its
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1989:
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1037:we can form a long exact sequence
1004:, an injective object is always a
630:is an abelian category, an object
443:{\displaystyle X\hookrightarrow Y}
14:
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1891:-essential morphism with domain
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23:
2152:F. Cagliari and S. Montovani, T
117:. The dual notion is that of a
105:. This concept is important in
2076:{\displaystyle {\mathcal {H}}}
2042:{\displaystyle {\mathcal {H}}}
1997:{\displaystyle {\mathcal {H}}}
1947:{\displaystyle {\mathcal {H}}}
1913:{\displaystyle {\mathcal {H}}}
1883:{\displaystyle {\mathcal {H}}}
1850:{\displaystyle {\mathcal {H}}}
1820:{\displaystyle {\mathcal {H}}}
1784:{\displaystyle {\mathcal {H}}}
1731:{\displaystyle {\mathcal {H}}}
1702:{\displaystyle {\mathcal {H}}}
1672:{\displaystyle {\mathcal {H}}}
1619:{\displaystyle {\mathcal {H}}}
1564:{\displaystyle {\mathcal {H}}}
1496:
1473:{\displaystyle {\mathcal {H}}}
1440:
1408:
1382:{\displaystyle {\mathcal {H}}}
1285:{\displaystyle {\mathcal {H}}}
1134:functors and also the various
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2056:Dedekind–MacNeille completion
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902:a non-canonical isomorphism.
124:
93:, especially in the field of
1758:{\displaystyle \mathbf {C} }
1647:{\displaystyle \mathbf {C} }
1593:{\displaystyle \mathbf {C} }
1356:{\displaystyle \mathbf {C} }
1311:{\displaystyle \mathbf {C} }
1261:{\displaystyle \mathbf {C} }
1114:and one can then define the
981:, an injective object is an
946:, an injective object is an
845:{\displaystyle \mathbf {C} }
812:{\displaystyle \mathbf {C} }
782:{\displaystyle \mathbf {C} }
744:{\displaystyle \mathbf {C} }
649:{\displaystyle \mathbf {C} }
623:{\displaystyle \mathbf {C} }
585:{\displaystyle \mathbf {C} }
210:{\displaystyle \mathbf {C} }
7:
2088:
905:
10:
2186:
2005:of anodyne extensions are
1537:{\displaystyle g\circ h=f}
1184:) or, more generally, any
1033:, i.e. for a given object
930:In the category of (left)
879:and an injective codomain
864:is a monomorphism only if
388:{\displaystyle h\circ f=g}
975:category of metric spaces
823:to an injective object.
570:carries monomorphisms in
2100:
1505:{\displaystyle g:B\to Q}
1480:there exists a morphism
1449:{\displaystyle h:A\to B}
1417:{\displaystyle f:A\to Q}
398:That is, every morphism
316:{\displaystyle h:Y\to Q}
291:there exists a morphism
284:{\displaystyle g:X\to Q}
249:{\displaystyle f:X\to Y}
32:This article includes a
1024:
970:has enough injectives).
755:is injective, then the
61:more precise citations.
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2014:partially ordered sets
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1268:be a category and let
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983:injective metric space
854:essential monomorphism
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417:{\displaystyle X\to Q}
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1199:
1186:Grothendieck category
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1031:injective resolutions
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600:In Abelian categories
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2012:In the category of
1975:In the category of
1710:-injective object.
1424:and every morphism
1118:of a given functor
1002:continuous mappings
992:In the category of
962:(as a consequence,
917:group homomorphisms
911:In the category of
868:is a monomorphism.
161:can be extended to
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2039:
1994:
1970:-injective objects
1944:
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34:list of references
2095:Projective object
2022:complete lattices
1334:{\displaystyle Q}
1154:or categories of
506:{\displaystyle g}
486:{\displaystyle f}
466:{\displaystyle h}
363:, i.e. such that
356:{\displaystyle Y}
336:{\displaystyle g}
185:{\displaystyle Q}
119:projective object
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2084:-injective hull.
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1116:derived functors
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57:this article by
48:inline citations
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1018:locally compact
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960:injective hulls
925:divisible group
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826:A monomorphism
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757:sequence splits
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38:related reading
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1192:Generalization
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1006:Scott topology
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913:abelian groups
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889:injective hull
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739:
727:exact sequence
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658:if and only if
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656:is injective
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1602:have enough
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1180:
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1169:ringed space
1161:
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1140:group theory
1138:theories in
1123:
1122:by applying
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223:monomorphism
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67:October 2021
64:
53:Please help
45:
1626:-injectives
1600:is said to
1156:sheaves of
789:is said to
662:hom functor
522:hom functor
91:mathematics
59:introducing
2137:References
2054:, and the
1792:-essential
1765:is called
1739:-morphism
1390:-injective
1321:An object
1200:An object
1167:over some
1136:cohomology
987:tight span
751:such that
596:set maps.
594:surjective
323:extending
256:and every
133:An object
125:Definition
107:cohomology
1523:∘
1497:→
1441:→
1409:→
1099:⋯
1096:→
1083:→
1070:→
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710:→
704:→
698:→
692:→
670:(–,
549:−
543:
435:↪
409:→
374:∘
308:→
276:→
241:→
219:injective
2164:Category
2089:See also
1828:only if
1228: :
1212: :
906:Examples
258:morphism
194:category
153: :
141: :
1925:, then
1895:and an
1165:modules
973:In the
932:modules
883:, then
55:improve
2020:, the
1832:is in
1802:is in
1684:to an
1224:, any
1130:, and
998:spaces
725:is an
171:object
149:, any
2126:(PDF)
2101:Notes
1865:is a
1512:with
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1014:sober
1008:on a
900:up to
676:exact
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516:In a
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1000:and
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1960:.
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1128:Ext
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968:Mod
956:Mod
944:Mod
891:of
871:If
830:in
797:of
729:in
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634:of
592:to
532:Hom
343:to
169:An
89:In
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1800:fg
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238:X
235::
232:f
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163:Y
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143:X
139:f
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