Algtop April 2015

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1 participants
2 discussions

seminario Topley 30 aprile
by Filippo Callegaro 30 Apr '15

30 Apr '15

Carissimi, mi scuso per il ritardo dell'avviso e vi ricordo il seminario di oggi pomeriggio. Cari saluti, Filippo ------------------------------------------------------- Giovedì 30 aprile, ore 16:00-17:00 Sala Riunioni Lewis Topley (Università di Padova) Titolo: Small representations for reduced enveloping algebras Abstract: Although the ordinary representation theory of Lie algebras is extremely well developed, progress has been much slower in the modular case. A breakthrough was made twenty years ago when Premet proved a long-standing conjecture bounding the dimensions of modules. His techniques led to the discovery of finite W-algebras, and the latter theory has recently culminated in another milestone, showing that the bound mentioned before is best possible. I shall review the development of this theory and discuss some very recent results of mine regarding the structure theory of certain modular finite W-algebras ------------------------------------------------------- Il programma completo dei seminari si trova alla pagina: http://www.dm.unipi.it/~gaiffi/homepageseminario/ Sulla pagina è anche possibile scaricare le slides dei precedenti seminari.

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seminario Collas 16 aprile
by Filippo Callegaro 13 Apr '15

13 Apr '15

Carissimi, riprendono dopo la lunga pausa i seminari di Algebra, Topologia e Combinatoria. Trovate di seguito l'avviso per l'appuntamento di questa settimana. Cari saluti, Filippo ------------------------------------------------------- Giovedì 16 aprile, ore 16:00-18:00 Sala Riunioni Benjamin Collas (Bayreuth Universität) Titolo: Arithmetic of inertia in braids groups and Grothendieck-Teichmüller theory. Abstract: Following Grothendieck's "Esquisse d'un programme", Grothendieck-Teichmüller theory is the study of the absolute Galois group of rational through combinatorial properties of the moduli spaces of curves M_{g,n}. Originally developed by Drinfel'd and Ihara in the context of quantum groups and arithmetic geometry, it is guided by the existence a certain stratification of the space which then translates in term of inertia when considered from the fundamental group point of view. We will present the main ideas of a Grothendieck-Teichmüller theory by considering first the case of curves of genus zero and its relation with the Artin braid groups -- all the needed notions will be given in detail within the case of M_{0,4}. By then considering the Artin braid groups as a special case of generalized braid groups, we will explain how these ideas can be adapted, and may lead to a similar ``Grothendieck-Dynkin'' theory, when studying the geometry of the wonderful model compactification of hyperplane arrangements. Il seminario sarà diviso in due parti di 45' ciascuna. La prima parte del seminario sarà introduttiva e comprensibile a studenti di dottorato o laurea specialistica in matematica. ------------------------------------------------------- Prossimi seminari: Giovedì 30 Aprile 2015, ore 16:00-18:00 Sala Riunioni Lewis Topley (Università di Padova) TBA ------------------------------------------------------- Il programma completo dei seminari si trova alla pagina: http://www.dm.unipi.it/~gaiffi/homepageseminario/ Sulla pagina è anche possibile scaricare le slides dei precedenti seminari.

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Algtop April 2015