Higher colimits, derived functors and homology
| Autor: | Sergei O. Ivanov, Vladimir Sosnilo, Roman Mikhailov |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Pure mathematics
Exact sequence Algebra and Number Theory Functor Cyclic homology K-Theory and Homology (math.KT) Homology (mathematics) Mathematics::Algebraic Topology Corollary Mathematics::K-Theory and Homology Mathematics::Category Theory Mathematics - K-Theory and Homology FOS: Mathematics Mathematics |
| Zdroj: | Sbornik: Mathematics. 210:1222-1258 |
| ISSN: | 1064-5616 |
| DOI: | 10.1070/sm9152 |
| Popis: | A theory of higher colimits over categories of free presentations is developed. It is shown that different homology functors such as Hoshcshild and cyclic homology of algebras over a field of characteristic zero, simplicial derived functors, and group homology can be obtained as higher colimits of simply defined functors. Connes' exact sequence linking Hochschild and cyclic homology was obtained using this approach as a corollary of a simple short exact sequence. As an application of the developed theory it is shown that the third reduced $K$-functor can be defined as the colimit of the second reduced $K$-functor applied to the fibre square of a free presentation of an algebra. A Hopf-type formula for odd dimensional cyclic homology of an algebra over a field of characteristic zero is also proved. Comment: 1 figure |
| Databáze: | OpenAIRE |
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