Simplicial sheaf
WebbStacks are described as sheaves of groupoids G G satisfying an effective descent condition, or equivalently such that the classifying object BG B G satisfies descent. The set of simplicial sheaf homotopy classes [∗,BG] [ ∗, B G] is identified with equivalence classes of acyclic homotopy colimits fibred over BG B G, generalizing the ... Webbsimplicial sheaves of groups because we can check it at each point. Last, note that the de nition BG n = Gn only depended on the multiplication in G. In particular, we could do the …
Simplicial sheaf
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Webb1 maj 2024 · In the introduction to his paper "Flasque Model Structures for Presheaves" (in fact simplicial presheaves) Isaksen states on the top of page 2 that his model structure has a nice characterisation of fibrant objects and that "This is entirely unlike the injective model structures, where there is no explicit description of the fibrant objects". WebbLet X be a finite simplicial complex. There is a well known linear algebra data description of (constructible with respect to the triangulation) sheaves of vector spaces on X. A …
WebbSuitably formulated, we can associate to a simplicial sheaf Xa simplicial sheaf of monoids consisting of homotopy self-equivalences of X. To this monoid we can apply the bar construction. One can prove that the resulting space classifies fibre sequences of simplicial sheaves. In our approach to the construction of classifying spaces, we introduce WebbIs there a good way to define a sheaf over a simplicial set - i.e. as a functor from the diagram of the simplicial set to wherever the sheaf takes its values - in a way that while defined on simplex by simplex corresponds in some natural manner to what a sheaf over the geometric realization of the simplicial set would look like?
WebbFor any pointed simplicial sheaf X in ∆opSh(Sm/k) one defines the A1-homotopy group sheaves, πA1 i(X), to be the sheaves of simplicial homotopy groups of a fibrant replacement of X in the A1-model structure. Morel, in his foundational work in [5, Ch. 6] has defined, for every integer i, A1-homology groups HA1 i(X) and canonical Hurewicz … WebbContents Introduction 1 Simplicial and Singular Intersection Homology 2 Some Computations 4 Homology with Local Coe cients 6 Some Useful Properties of Intersection Homology 7 Sheaf-Theoretic Intersection Homology 8 INTERSECTION HOMOLOGY SIDDHARTH VENKATESH Abstract.
Webbrooted fibrations of simplicial sheaves. On the other hand, fibrations of simplicial sheaves correspond to principal bundles under homotopy self-equivalences. Suitably formulated, we can associate to a simplicial sheaf Xa simplicial sheaf of monoids consisting of homotopy self-equivalences of X. To this monoid we can apply the bar …
WebbNow X is a simplicial sheaf if for every object U 2Cand R 2 (U) the map ˝ R is an isomorphism (this definition is from [Jardine, 2007, p.37]). Note that an equivalent way to define simplicial sheaves would be as simplicial objects in the category of sheaves. The sim-plicial sheaves form a full subcategory SSh(C) of SPre(C) and there is chrysler fncl corp in santa ana caWebbBetter: A simplicial ring A • is a sheaf on Δ (the category of finite ordered sets endowed with the chaotic topology). Then a simplicial module over A • is just a sheaf of modules. … deschain knitting patternWebb20 nov. 2024 · Let X be a locally fibrant simplicial sheaf on the big étale site for k, and let Y be a k scheme which is cohomologically proper. Then there is a Künneth-type … chrysler force 85 horse model 856x3lWebb15 aug. 2024 · A sheaf is a certain functor O p e n ( X) o p → C, where C is a 1-category, satisfying a certain limit condition. A stack is a functor O p e n ( X) o p → D, where D is a 2-category, satisfying a more complicated condition. In this case, D is the category of categories and C is the category of sets. – Mark Saving Aug 15, 2024 at 17:51 chrysler for sale in uaeWebb8 dec. 2024 · simplicial homology generalized homology exact sequence, short exact sequence, long exact sequence, split exact sequence injective object, projective object … de schalm theaterIn mathematics, more specifically in homotopy theory, a simplicial presheaf is a presheaf on a site (e.g., the category of topological spaces) taking values in simplicial sets (i.e., a contravariant functor from the site to the category of simplicial sets). Equivalently, a simplicial presheaf is a simplicial object in the … Visa mer Let F be a simplicial presheaf on a site. The homotopy sheaves $${\displaystyle \pi _{*}F}$$ of F is defined as follows. For any $${\displaystyle f:X\to Y}$$ in the site and a 0-simplex s in F(X), set Visa mer • Konrad Voelkel, Model structures on simplicial presheaves Visa mer The category of simplicial presheaves on a site admits many different model structures. Some of them are … Visa mer • cubical set • N-group (category theory) Visa mer • J.F. Jardine's homepage Visa mer des chamallowWebbwhich is defined for any abelian sheaf A on the ´etale site for k. Here, L varies through the finite Galois extensions of k, and we write G = Gal(L/k) for the Galois group of such an extension L. Here, the scheme Sp(L) is the Zariski spectrum of the field L. The simplicial sheaf EG ×G Sp(L) is the Borel construction for the action of chrysler for sale in south africa