| Orateur(s) | Florian Pop - Université de Pennsylvanie,
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| Titre | Complements of line/hyperplane arrangements and absolute Galois groups. |
| Date | 29/10/2021 |
| Horaire | 15:00 à 16:00 |
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| Diffusion | sur Zoom, demander les informations à Cyril Demarche |
| Résume | One of the main themes of Grothendieck's "Esquisse d'un Programme" was to give a combinatorial/topological description of absolute Galois groups. In this talk I plan to: First briefly recall two developments concerning the above theme from the Esquisse, namely the Grothendieck-Teichmueller group (GT) and the Ihara question/Oda-Matsumoto conjecture (I/OM), and explain how they fit into the bigger picture about the above theme. Second, I plan to explain a very recent result (collaboration with Adam Topaz) concerning a line/hyperplane variant of GT which: (i) is closer in nature to GT than I/OM is; (ii) it gives a topological description of absolute Galois, e.g. of that of Q. |
| Salle | exposé à distance, retransmis en salle 15-16-413 |
| Adresse | Campus Pierre et Marie Curie
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