NICUȘOR DAN, President of Romania: an exceptional scientific career in France @IhesFr

Uploaded April 2026 | Updated September 2026, 3 weeks ago

Nicușor Dan, President of Romania, is a mathematician by training. A double gold medalist at the International Mathematical Olympiad in 1987 and 1988, he began his studies in mathematics at the University of Bucharest.
In 1992, he was admitted through a competitive entrance exam to the École normale supérieure, an institution that trains many of France’s top mathematicians. In 1993, he began a PhD in mathematics at Université Sorbonne Paris Nord, conducting his research at the Institut des Hautes Études Scientifiques under the supervision of Christophe Soulé, who was elected a member of the French Academy of Sciences in 2001.
Nicușor Dan defended an outstanding doctoral thesis in 1998. Although he could have pursued an international academic career, he chose instead to return to his country as a researcher at the “Simion Stoilow” Institute of Mathematics of the Romanian Academy, where he continued conducting high-level research until 2011.

NICUȘOR DAN, President of Romania: an exceptional scientific career in France

Charlotte Sleight - 1/4 Cosmological Bootstrap

Marko Simonovic - 4/4 Effective Field Theory of Large Scale Structure

Duong Phong - The Einstein Equation in Kähler Geometry

$Arthur-César Le Bras - Geometric Aspects of the $p$-adic Locally Analytic Langlands (...) The goal of these lectures is to discuss some aspects of the geometrization of the $p$-adic Langlands program (more precisely, the part of it which deals with locally analytic representations on topological $mathbb{Q}_p$-vector spaces). The lectures by Hellmann (based on joint work with Hernandez and Schraen and with Heuer) will focus on the « Galois » side, introducing moduli stacks of (variants of) $p$-adic Galois representations and on the study of their geometry. The lectures of Le Bras (based on joint work with Anschütz, Rodriguez Camargo, Scholze) will focus on the « automorphic » side, explaining how to realize locally analytic representations as sheaves on a variant of Fargues-Scholze’s stack of $G$-bundles on the Fargue-Fontaine curve. Arthur-César Le Bras (Université de Strasbourg) Find this and many more scientific videos on https://www.carmin.tv/ - a French video platform for mathematics and their interactions with other sciences offering extra functionalities tailored to meet the needs of the research community.$

Ugo Moschella - De Sitter, anti De Sitter and all that

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$Arthemy Kiselev - The Wronskians over Multidimension and Homotopy Lie Algebras The Wronskian determinant of $N$ functions in one variable $x$ helps us verify that they are linearly independent on an interval $(a, b)$ in ${mathbb R}$. Can we have an equally convenient procedure over multidimensional spaces ${mathbb R}^d$ with Cartesian coordinates $x, y, z, . . .$ ? Yes we can; let us study the definition of Wronskians for functions in many variables, and let us explore which differential-algebraic identities these structures satisfy. To see why the Wronskian determinants actually do satisfy a set of quadratic, Jacobi-type identities, we observe first that the Wronskian of size $2 times 2$ results from commutation of vector fields on the real line ${mathbb R}$. From differential geometry we know that vector fields are differential operators of strict order $p = 1$. By taking the alternated composition of $N = 2p$ differential operators of strict order $p gt 0$ on the affine line, we obtain the operator of same order $p$ with the Wronskian determinant for coefficient. As we had the Jacobi identity for the Lie algebra of vector fields, so we establish the (table of) quadratic, Jacobi-type identities for higher-order Wronskians of $N gt 1$ arguments. (In string theory, these identities govern homotopy deformations of Lie algebras, here of vector fields.) We prove that the new Wronskians over multidimensional base with $d$ coordinates $x, y, z,. . .$ do satisfy the (table of) identities for strongly homotopy Lie algebras. The problem is to understand how fast the dimension grows under iterated $N$-ary brackets. We spot a countable chain of finite-dimensional homotopy Lie algebras that generalize the vector field realization of $sl(2)$ on ${mathbb R}$; we explicitly calculate all the structure constants. Yet the four-dimensional analogue of $sl(2)$ over the plane ${mathbb R}^2$ with Cartesian coordinates $(x, y)$, now with ternary bracket from the Wronskian, is so far the only known finite-dimensional homotopy Lie algebra of this type over base dimension $gt 1$. The hunt is on; we conclude that Lie algebra $sl(2)$ is the prototype not only for semisimple complex Lie algebras encoded by root systems but also for countably many $N$-ary homotopy Lie algebras. Arthemy Kiselev (University of Groningen) Find this and many more scientific videos on https://www.carmin.tv/ - a French video platform for mathematics and their interactions with other sciences offering extra functionalities tailored to meet the needs of the research community.$

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Cyril Banderier - Phase Transitions and Mittag-Leffler Functions for Critical Schemes Under (...)