Geometria_Pisa April 2024

geometria_pisa@lists.dm.unipi.it

4 participants
7 discussions

Fwd: Postdoc position at Università di Firenze
by Bruno Martelli 24 Apr '24

24 Apr '24

---------- Forwarded message --------- Da: Daniele Angella <daniele.angella(a)unifi.it> Date: Mer 24 Apr 2024, 08:10 Subject: Postdoc position at Università di Firenze To: geometriaglobale-group(a)unifi.it <geometriaglobale-group(a)unifi.it>, dimai-geometria-group(a)unifi.it <dimai-geometria-group(a)unifi.it>, GEOMETRY(a)listserv.utk.edu <GEOMETRY(a)listserv.utk.edu>, EAGER-GEN(a)listserv.dfn.de <EAGER-GEN(a)listserv.dfn.de> Dear all, We are looking for … [View More]

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I: Seminario baby geometri
by Giovanni Framba 22 Apr '24

22 Apr '24

Dato che il seminario di geometria è stato annullato, condivido l'invito al seminario dei BabyGs. Vi aspettiamo, Giovanni ________________________________ Da: Giovanni Framba via Dottorandi <dottorandi(a)lists.dm.unipi.it> Inviato: lunedì 22 aprile 2024 21:32 A: Studenti <studenti(a)dm.unipi.it>; dottorandi(a)dm.unipi.it <dottorandi(a)dm.unipi.it>; babygs-users(a)googlegroups.com <babygs-users(a)googlegroups.com> Oggetto: [dottorato] Seminario baby geometri Carə … [View More]tuttə, Il seminario dei baby geometri di questa settimana si terrà domani Martedì 23 Aprile alle 14.30 in Aula Riunioni. Manousos Manouras (Université de Pau / Universidad de Zaragoza) parlerà di "Alexander type invariants of line arrangements". Di seguito l'abstract. There have been various definitions of the Alexander invariants of a knot. Following some of these definitions one can generalise them so as to have coefficients twisted by a linear representation. The Alexander type invariants are known to detect non-trivial topological information(genus, hyperbolic volume of a knot etc). The twisted Alexander polynomial was introduced by Wada for knots and has been studied thereafter for more general manifolds as the complement of algebraic curves or line arrangements. We will discuss the relation of the twisted Alexander polynomial of the exterior manifold of a line arrangement and the twisted Alexander polynomial of its boundary manifold. We will present how using twisted Alexander polynomials induced by reducible representations, we can retract nontrivial topological information. We will also deal with the characteristic varieties of line arrangements, studied by various authors such as Zariski, Libgober, Artal. The main problem is to understand if the characteristic varieties are combinatorially determined in general. This is known to be true for their ”homogeneous part”, which corresponds to the resonance variety, as well as for the translated components having dimension at least one, as they are determined by orbifold pencils. This does not work in the same way for the 0-dimensional translated components. Here we present examples such that the characteristic variety has some translated 0-dimensional global component. Ci troveremo alle 13 in atrio per andare a pranzo con lo speaker. Le informazioni sui prossimi seminari si trovano sul sito dei Baby Geometri! Vi aspettiamo! Buona serata, Filippo, Giovanni e Giuseppe [View Less]

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Seminario di geometria 23/04
by Filippo Bianchi 22 Apr '24

22 Apr '24

Carə tuttə, Il seminario di geometria di questa settimana si terrà domani Martedì 23 Aprile alle 14.30 in Aula Riunioni. Isaac Sundberg (MPIM Bonn) parlerà di "Khovanov homology and surfaces in the 4-ball". Di seguito l'abstract. It is difficult to detect differences between topological and smooth phenomena, so it was surprising when Rasmussen used a purely combinatorial theory, known as Khovanov homology, to obstruct the smooth sliceness of topologically slice knots. In this talk, we … [View More]

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Seminario di geometria 15/04
by Filippo Bianchi 14 Apr '24

14 Apr '24

Carə tuttə, Il seminario di geometria della prossima settimana si terrà eccezionalmente domani Lunedì 15 Aprile alle 11.00 in Aula Magna. Marco Golla (Université de Nantes) parlerà di "Line arrangements with only triple points". Di seguito l'abstract. Line arrangements are unions of lines in a (projective or affine) space over some field and they are studied from a combinatorial or algebro-geometrical standpoint. (Non-trivial) complex line arrangements always have at least a double or a … [View More]

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I: Conference in low-dimensional topology - Budapest 8th-12th July 2024
by Paolo Lisca 10 Apr '24

10 Apr '24

Inoltro annuncio di convegno di topologia in bassa dimensione. Paolo Lisca ________________________________ Da: marengon <marengon.marco(a)renyi.hu> Inviato: mercoledì 10 aprile 2024 01:18 A: New.Structures Low.Dimensional.Topology Oggetto: Conference in low-dimensional topology - Budapest 8th-12th July 2024 Dear colleague, We would like to advertise a conference in low-dimensional topology, organized by the Simons collaboration "New structures in low-dimensional topology", which will … [View More]

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Seminario di geometria 11/04
by Filippo Bianchi 09 Apr '24

09 Apr '24

Carə tuttə, Giovedì 11 Aprile alle 14.30 in Aula Seminari si terrà il seminario di Michael Brandenbursky (Ben Gurion University of the Negev) dal titolo "Invariant norms on diffeomorphism groups: old and new results". Di seguito l'abstract. Invariant norms appear in most branches of mathematics. Examples include word norms (autonomous, entropy, fragmentation) and non-discrete norms (Hofer norm) in symplectic geometry. In group theory examples include commutator length and primitive length. … [View More]

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Seminario Paolo Ghiggini domani
by Bruno Martelli 03 Apr '24

03 Apr '24

Buongiorno, Con colpevole ritardo segnalo il seminario di geometria di domani (ore 14.30 aula seminari). A presto, Bruno ----- Orbite di Reeb e invarianti di varietà suturate Paolo Ghiggini Giovedì 4 apr 2024 - 14:30 Aula Seminari (Department of Mathematics) Le orbite chiuse del flusso di Reeb di una forma di contatto producono un invariante topologico di varietà di dimensione tre detto "omologia di contatto immersa" definito da Michael Hutchings circa vent'anni fa. In seguito la … [View More]

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Geometria_Pisa April 2024