Nori fundamental gerbe of essentially finite covers and Galois closure of towers of torsors
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| Autors: | , , , , |
|---|---|
| Format: | artículo original |
| Data de publicació: | 2019 |
| Descripció: | We prove the existence of a Galois closure for towers of torsors under finite group schemes over a proper, geometrically connected and geometrically reduced algebraic stack X over a field k. This is done by describing the Nori fundamental gerbe of an essentially finite cover of X. A similar result is also obtained for the S -fundamental gerbe. |
| Pais: | Kérwá |
| Institution: | Universidad de Costa Rica |
| Repositorio: | Kérwá |
| Idioma: | Inglés |
| OAI Identifier: | oai:kerwa.ucr.ac.cr:10669/79845.2 |
| Accés en línia: | https://link.springer.com/article/10.1007/s00029-019-0449-z https://hdl.handle.net/10669/79845.2 |
| Paraula clau: | Nori fundamental gerbe Essentially finite bundle Essentially finite cover Algebraic stack |