In algebraic topology, a presheaf of spectra on a topological space X is a contravariant functor from the category of open subsets of X, where morphisms are inclusions, to the good category of commutative ring spectra. A theorem of Jardine says that such presheaves form a simplicial model category, where F →G is a weak equivalence if the induced map of homotopy sheaves is an isomorphism. A sheaf of spectra is then a fibrant/cofibrant object in that category.
The notion is used to define, for example, a derived scheme in algebraic geometry.
YouTube Encyclopedic
-
1/3Views:1 8733 003786
-
Sites and Sheaves Mainline 1
-
Sheaves and Stalk
-
Joel Friedman - Sheaves on Graphs, L^2 Betti Numbers, and Applications.
Transcription
References
External links
- Goerss, Paul (16 June 2008). "Schemes" (PDF). TAG Lecture 2.
![](/s/i/modif.png)