Tropical Geometry Workshop, 2019, October 28 - November 1. **Real geometry in the footsteps of Gabriel Cramer**

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Monday, October 28, 16:30, Battelle, Ilia Itenberg, “Planes in four-dimensional cubics”.

Tuesday, October 29, 11:45, Battelle, Nikita Kalinin,“Symplectic packing problem”. Tuesday, October 29,14:45, Battelle, Kristin Shaw, “Poincaré duality for tropical manifolds”.

Wednesday, October 30, 10:30, Battelle, Kristin Shaw,“Poincaré duality for tropical manifolds”.

Thursday, October 21, 11:00,Battelle, Kristin Shaw,“Poincaré duality for tropical manifolds”.

Thursday, October 21,14:30, Battelle, Nikita Kalinin,“Symplectic packing problem and Nagata's Conjecture”.

Friday, November 1, 15:00, Battelle, Nikita Kalinin, “Symplectic packing problem and Nagata's Conjecture”.

Journée de géométrie énumérative raffinée, 25.06.2016, villa Battelle, 9.30-15.00

2015,30-31 March, Berlin, Tropical Geometry in Europe, http://www.math.univ-toulouse.fr/~bbertrand/TGE/index.html

2014, Tuesday Nov 4, Villa Batelle,
15.47, Nikita Kalinin
**“Tropical curves as thermodynamical limit in sandpile models, continuation.“**

I will prove some announced in previous talk things and explain some generalisations. All of them are quite simple, but unexpectedly produce beautiful pictures. This is joint work with M.Shkolnikov.

Thu June 26 Yakov Eliashberg (Stanford), Battelle at 16:15 Lagrangian non-intersection theory

It turns out that the Lagrangian self-intersection problem is controlled in a general case by differential and not symplectic topology. For instance, for any orientable 3-manifold there exists a Lagrangian immersion to the standard symplectic R^6 with exactly one transverse self-intersection point. This is a joint work with Emmy Murphy, Tobias Ekholm and Ivan Smith.

June 16-20 Conference in the Bernoulli Center http://bernoulli.epfl.ch/images/big/1006_eve.jpg

Fri June 13 Yakov Eliashberg (Stanford), Battelle at 14:30 All manifolds are contact except those which are obviously not

We prove that all closed almost contact manifolds admit contact structures, and moreover, in the space of contact structures there exists an open-closed subspace of the so-called “overtwisted” contact structures whose classification up to isotopy coincides wth the homotopy classification as almost contact structures. This is a joint work with Strom Borman and Emmy Murphy

Thu June 12 Oleg Viro (Stony Brook) Bernoulli Lecture http://bernoulli.epfl.ch/images/big/1041_eve.jpg

Thu June 5 Elizabeth Baldwin (London School of Economics), Batelle at 16:15 The geometry of auctions and competitive equilibrium with indivisible goods

Auctioneers may wish to sell related but different indivisible goods in a single process. To develop such techniques, we study the geometry of how an agent's demanded bundle changes as prices change. This object is the convex-geometric object known as a `tropical hypersurface'. Moreover, simple geometric properties translate directly to economic properties, providing a new taxonomy for economic valuations. When considering multiple agents, we study the unions and intersections of the corresponding tropical hypersurfaces; in particular, properties of the intersection are deeply related to whether competitive equilibrium exists or fails. This leads us to new results and generalisations of existing results on equilibrium existence. The talk will provide an introductory tour to relevant economics to show the context of these applications of tropical geometry. This is joint work with Paul Klemperer, Oxford.

Mirror symmetry for all and Mirror Symmetry Seminar

Conformal Field Theory Seminar

May 26-31 Gökova http://gokovagt.org/2014/index.html

Thu 22 May working seminar Johannes Josi, Battelle at 13h

I will speak about a presentation of the isometry group of the Euclidean plane and the orthogonal groups O(n) using generators and relations, following O. Viro's recent preprint http://arxiv.org/abs/1405.1460.

Thu 15 May 2014 15:00 - 16:00 By Lothar Göttsche Bernoulli Lecture - Refined curve counting and tropical geometry (http://cib.epfl.ch/)

Feb 3, 14:30, Michael Polyak (Technion) “Deformation quantization of Poisson structures and geometry of configuration spaces”

Feb 5, 17:15, Tobias Ekholm (Uppsala) “Knot contact homology and its ramifications”

(http://cib.epfl.ch/)Torically maximal surfaces Tue 28 January 2014 16:00 - 17:00

By BRUGALLÉ Erwan (Université Pierre et Marie Curie, Paris, France)

(http://cib.epfl.ch/) Limit Mixed Hodge structures associated with degenerations I

Tue 28 January 2014 14:00 - 15:00

Limit Mixed Hodge structures associated with degenerations II

Tue 04 February 2014 14:00 - 15:00 By MIGLIORINI Luca (Université de Bologne)

Feb 25 – Mar 1. Johannes Rau visits us. Tentatively he gives a talk on Wedesday, Feb 27.

Mar 18-23. Alexey Bondal visits us. He'll give a departmental colloquium and a seminar talk.