Différences

Ci-dessous, les différences entre deux révisions de la page.

--- start [2025/02/01 10:57] – [Seminars and conferences] g.m
+++ start [2025/11/07 21:14] (Version actuelle) – g.m
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 Johannes Josi (February 2018).
-Current members: Thomas Blomme, Francesca Carocci, Aloïs Demory, Gurvan Mével, [[Grigory Mikhalkin|Grigory Mikhalkin]], Antoine Toussaint.
+Current members: Thomas Blomme, [[Grigory Mikhalkin|Grigory Mikhalkin]], Antoine Toussaint.
-Alumni: Ivan Bazhov, Johan Bjorklund, Rémi Crétois, Weronika Czerniawska, Yi-Ning Hsiao, Jens Forsgard, Maxim Karev, Ilya Karzhemanov, Sergei Lanzat, Michele Nesci, Alina Pavlikova, Mikhail Pirogov, Johannes Rau, Arthur Renaudineau.
+Alumni: Ivan Bazhov, Johan Bjorklund, Francesca Carocci, Rémi Crétois, Weronika Czerniawska, Aloïs Demory, Yi-Ning Hsiao, Jens Forsgard, Maxim Karev, Ilya Karzhemanov, Sergei Lanzat, Gurvan Mével, Michele Nesci, Alina Pavlikova, Mikhail Pirogov, Johannes Rau, Arthur Renaudineau.
 We organize several seminars:
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 ----
-Joé Brendel (ETHZ)
+  Enzo Pasquereau (Université de Nantes), Monday, Oct 13, 14h00, room 01-15 (Seminaire "Fables Géométriques")
+"Combinatorial patchworking in codimension 2 and more"
+Abstract: Combinatorial patchworking is a powerful method used for constructing real algebraic hypersurfaces with controlled topology. I will discuss generalization of this method to higher codimension using real phase structure.
+In codimension 2, we give explicit patchworking rules (based on triangulations, sign distributions, and edge orientations) similar to Viro's original formulation for hypersurface.
+As an application, we obtain families of maximal T-curves in real projective 3-space. For higher codimension, we derive new bounds on the number of connected components and prove non-existence of maximal T-curves (for codimension >3) and of high codimension T-surfaces.
+  Joé Brendel (ETHZ), Friday, Feb 21, 15h15, room 6-13 (Seminaire "Fables Géométriques")
 "Split tori in S^2 x S^2, billiards and ball-embeddability"
 Abstract: In this talk we will discuss the symplectic classification of Lagrangian tori that split as circles in S^2 x S^2. As it turns out, this classification is equivalent to playing mathematical billiards on a rectangular table. This has many interesting applications, for example to Lagrangian packing and the topological study of the space of Lagrangians. We will focus on one application in particular, asking which Lagrangian tori are contained in the image of a symplectic ball embedding. There are many open questions of more general interest surrounding this property of "ball-embeddability" of Lagrangians, which we will discuss at the end of the talk. This is joint work with Joontae Kim.
+  Gurvan Mével (UNIGE), Wednesday, Feb 19, 14h00, room 1-07 (Seminaire "Fables Géométriques")
+"Floor diagrams and some tropical invariants in positive genus"
+Abstract : Göttche-Schroeter invariants are a rational tropical refined invariant, i.e. a polynomial counting genus 0 curves on toric surfaces, that can be computed with a floor diagrams approach. In this talk I will explain that this approach extends in any genus. This gives new invariants, related to ones simultaneously defined by Shustin and Sinichkin. I will then say few words on a quadratically enriched (and not refined !) version of this extension.
+  Uriel Sinichkin (Tel-Aviv), Wednesday, Feb 5, 14h00, room 1-07 + Zoom (Seminaire "Fables Géométriques")
+"Refined Tropical Invariants and Characteristic Numbers"
+Abstract: In this talk I will present a generalization of Goettche-Schroeter and Schroeter-Shustin refined counts of tropical curves that splits to a product of terms on small fragments of the curves. This count is invariant in each of the following situations: either genus at most one, or a single contact element, or point conditions in Mikhalkin position. I will compare our results to Mével’s floor diagram approach, and discuss the specialization of the count at q=1, which recovers certain characteristic numbers.
   Thomas Blomme (Neuchâtel), Friday, Jan 31, 14h00, room 1-07 (Seminaire "Fables Géométriques")