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22-26 juin 2015
Centre Paul-Langevin AUSSOIS
Europe/Paris timezone
In honor of Bernard Teissier's 70th birthday
Accueil > Contribution List

Liste des présentations

Affichage20 contributions sur 20
Présenté par Mrs. María PE PEREIRA
I will review some results which relate these areas of mathematics. Newton polyhedra connect algebraic geometry and the theory of singularities to the geometry of convex polyhedra. This connection is useful in both direc- tions. On the one hand, explicit answers are given to problems of algebra and the theory of singularities in terms of the geometry of polyhedra. On the other hand, algebraic the ... Plus
Présenté par Mr. Askold KHOVANSKII on 22 juin 2015 à 15:15
Session: Specific talk
Présenté par Mr. Mark SPIVAKOVSKY
Session: Morning session
We prove that if f is a positive C^2 function on a convex compact set X then it becomes strongly convex when multiplied by (1+|x|^2)^N with N large enough. For f polynomial we give an explicit estimate for N, which depends on the size of the coefficients of f and on the lower bound of f on X. As an application of our convexification method we propose an algorithm which for a given polynomia ... Plus
Présenté par Mr. Krzysztof KURDYKA
Session: Morning session
I will begin by explaining motivations from mirror symmetry. Then I will present some new results concerning tropical geometry and non-archimedean geometry. As an application, I will talk about the enumeration of curves in log Calabi-Yau surfaces. An explicit computation for a del Pezzo surface will be presented in detail. The enumeration is related to the notion of broken lines in the works by Gr ... Plus
Présenté par Mr. Tony Yue YU
Session: Morning session
Part of Bernard Teisier¹s work is a substantial contribution to equisingularity theory. In this talk I will discuss three of the many inspirations his work has given me, and their role in my current approach to the equisingularity of isolated singularities. The talk will use determinantal singularities as an illustration of these ideas.
Présenté par Mr. Terence GAFFNEY on 22 juin 2015 à 10:00
Session: Morning session
I will discuss a surprising relation between the free divisors in the complex projective plane (and a slight extension of them called the nearly free divisors) and the rational cuspidal curves. A number of conjectures express this relation and some of them are proved in special cases.
Présenté par Mr. Alexandru DIMCA
Présenté par Mr. Jean PETITOT
Présenté par Mr. Patrick POPESCU-PAMPU
Session: Morning session
We prove that germs of analytic maps of complex analytic varieties can be made monomial by sequences of local blow ups of nonsingular analytic subvarieties in the domain and target along an arbitrary étoile. An étoile and the voûte étoilée is a generalization by Hironaka of valuations and the Zariski Riemann manifold to analytic spaces.
Présenté par Mr. Steven Dale CUTKOSKY on 22 juin 2015 à 11:30
I will give an overview of a proof of a conjecture of Read that the coefficients of the chromatic polynomial of any graph form a unimodal sequence. There are two main ingredients in the proof, both coming from works of Bernard Teissier: The first is the idealistic Bertini for sectional Milnor numbers, and the second is the isoperimetric inequality for mixed multiplicities of ideals.
Présenté par Mr. June HUH on 22 juin 2015 à 14:00
Let A be an affine variety inside a complex N dimensional vector space which has an isolated singularity at the origin. The intersection of A with a very small sphere turns out to be a manifold called the link of A. The link has a natural hyperplane distribution called a contact structure. If the singularity is numerically Q-Gorenstein then we can assign an invariant of our singularity called the ... Plus
Présenté par Mr. Mark MCLEAN
Session: Morning session
Many non-Noetherian rings and topological spaces equipped with the action of a large group or monoid are in fact Noetherian up to that action. This phenomenon is responsible for several recent finiteness results in algebraic geometry and commutative algebra. I will discuss examples concerning certain infinite-dimensional toric varieties with an action of the infinite symmetric group, and concerni ... Plus
Présenté par Mr. Jan DRAISMA
I will discuss Lipschitz stratification from a nonarchimedean point of view and thereby show that it exists for definable sets, not necessarily bounded, in any polynomial-bounded o-minimal field structure. Unlike the previous approaches in the literature, our method bypasses resolution of singularities and Weierstrass preparation altogether; it transfers the situation to a nonarchimedean model, wh ... Plus
Présenté par Mr. Yimu YIN
Minimal log discrepancies are invariants of singularities defined using the divisorial valuations centered at one point. They play an important role in birational geometry and several questions about them are widely open. In this talk I will give an introduction to this circle of ideas, I will discuss some of these questions and some partial results.
Présenté par Mr. Mircea MUSTATA
Session: Morning session
We study the implicit equations defining the image and the graph of rational maps between projective spaces, under the hypothesis that the base locus has codimension at most three and is defined by a Gorenstein ideal. We provide degree bounds for these implicit equations, and we describe them explicitly if the syzygies of the Gorenstein ideal are all linear. This is joint work with Andy Kusti ... Plus
Présenté par Mr. Bernd ULRICH
Session: Morning session
Motivated by mathematical physics, Block and Göttsche have defined "quantized" versions of Mikhalkin's multiplicities for tropical curves. In joint work with Sam Payne and Franziska Schroeter, we propose a geometric interpretation of these invariants as chi_y genera of semi-algebraic analytic domains over the field of Puiseux series. In order to define and compute these chi_y genera, we use the t ... Plus
Présenté par Mr. Johannes NICAISE
Session: Morning session
De Jong's famous theorem states that any integral variety can be resolved by an alteration. Recently Gabber strengthened this by proving that for any fixed prime l not equal to the characteristic, the alteration can be taken of degree prime to l. In my talk I will tell about Gabber's results and some newer progress on this topic.
Présenté par Mr. Mikael TEMKIN
In the spirit of famous papers by Pila & Bombieri and Pila & Wilkie, I will explain how to bound the number of rational points, with respect to their height, in various kinds of sets, such as algebraic varieties of a given degree, transcendental sets definable in some o-minimal (or even not o-minimal) structure over the real field, and, after joint work with R. Cluckers and F. Loeser, also def ... Plus
Présenté par Mr. Georges COMTE