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This lecture is devoted to the various observations of seismic anisotropy in the upper mantle and their dynamic interpretation : global seismic tomography describing recent results on the distribution of polarization anisotropy and azimuthal anisotropy ; …

The size of the cortex depends to a large extent on the number of neural stem cells and their divisions prior to differentiation into neurons. The lecture therefore focused on the cellular and genetic mechanisms involved in amplifying the number of …

Abstract In the course of archaeological excavations in Algeria's ancient cities, vestiges of economic life have been uncovered and sometimes observed, but never systematically, nor with sufficient care and interest to enable us to draw coherent readings …

Given an n-dimensional smooth hypersurface X of degree d in projective space, it is elementary that X is irrational when d > n+1, but it is interesting to ask "how irrational" such a hypersurface can be. We discuss various measures of irrationality, and …

Using Verbitsky's Torelli theorem, we show the existence of various isomorphisms between certain hyperkähler fourfolds. …

A genus-g du Val curve is a degree-3g plane curve having 8 points of multiplicity g, one point of multiplicity g-1, and no other singularity. In a joint work with A. Bruno, G. Farkas and G. Saccà, we prove that a general du Val curve is …

In recent years, there have been an increasing number of connections between cubic 4folds and hyperkahler manifolds. The first instance of this was noticed by Beauville- Donagi, who showed that the Fano varieties of lines on a cubic 4folds X is …

I will discuss kappa classes on the moduli space of quasi-polarized K3 surfaces and relations obtained from the moduli spaces of stable maps to the universal family. I will explain the proof of the generation of the tautological ring by Noether-Lefschetz …

The goal of the talk will be to discuss L" extension properties of holomorphic sections of vector bundles satisfying weak semi-positivity properties. Using techniques borrowed from recent proofs of the Ohsawa-Takegoshi extension theorem, we obtain several …

In his seminar, John Parkington (University of Cape Town) detailed the accumulation of innovations that characterized the late Middle Stone Age in South Africa. These innovations concerned both the technical and symbolic spheres. They brought the …

I will report on an approach to the GT for cubic fourfolds that uses the relation beween Kuznetsov's K3 category associated with any cubic fourfold and K3 …

The earliest forms considered to be close to "anatomically modern man" are known from East Africa, from 200,000 years before present. In reality, neither paleontological data nor the coalescence point of present-day genomes allow us to rigorously …

This is a report on joint work with Radu Laza. The period map from the GIT moduli space of quartic surfaces to the Baily-Borel compactification of the period space is birational but far from regular. New birational models of locally symmetric varieties of …

In a celebrated series of papers, Mukai established structure theorems for polarized K3 surfaces of all genera g21, with the exception of the case g=14. Using Hassett's identification between the moduli space of polarized K3 surfaces of genus 14 and the …

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In this lecture, we introduce the various sources of anisotropy at the crystal and rock scale, contributing to macroscopic observations, followed by basic notions of elasticity and seismic wave propagation in an anisotropic medium. We describe the …