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Lagrange - history of mathematics - 19th century - fluid mechanics

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In this talk we will don't speak about Joseph-Louis Lagrange (1736-1813) but about Lagrange's reception at the nineteenth Century. "Who read Lagrange at this Times?", "Why and How?", "What does it mean being a mathematician or doing mathematics at this Century" are some of the questions of our conference. We will give some elements of answers and the case Lagrange will be a pretext in order to explain what are doing historians of mathematics: searching archives and – thanks to a methodology – trying to understand, read and write the Past.
Lagrange - mathematical press - complete works - bibliographic index of mathematical sciences (1894-1912) - Liouville - Boussinesq - Terquem[-]

In this talk we will don't speak about Joseph-Louis Lagrange (1736-1813) but about Lagrange's reception at the nineteenth Century. "Who read Lagrange at this Times?", "Why and How?", "What does it mean being a mathematician or doing mathematics at this Century" are some of the questions of our conference. We will give some elements of answers and the case Lagrange will be a pretext in order to explain what are doing historians of mathematics: ...[+]

01A50 ; 01A55 ; 01A70 ; 01A74 ; 01A80

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The study of Markoff triples, solutions to $ x^{2} + y^{2} + z^{2} = 3xyz $, spans over many fields. In this talk, we discuss arithmetic of Markoff triples by considering Markoff mod-p graphs. We will delve into what is known about their connectivity, going into a recent result which is joint work with Eddy, Litman, Martin, and Tripeny.

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The dynamics of billiards in a regular polygon can be studied from a wide range of mathematical perspectives. In this talk we will discuss connections between periodic billiard paths and number theory, modular symbols, heights and Hilbert modular varieties. In particular we will describe a new form of arithmetic chaos that emerges from dynamics in the regular 12-gon.

Sélection Signaler une erreur

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Sélection Signaler une erreur

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Sélection Signaler une erreur

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We study repeated bilateral trade where an adaptive σ-smooth adversary generates the valuations of sellers and buyers. We provide a complete characterization of the regret regimes for fixed-price mechanisms under different feedback models in the two cases where the learner can post either the same or different prices to buyers and sellers. We begin by showing that the minimax regret after $T$ rounds is of order $\sqrt{T}$ in the full-feedback scenario. Under partial feedback, any algorithm that has to post the same price to buyers and sellers suffers worst-case linear regret. However, when the learner can post two different prices at each round, we design an algorithm enjoying regret of order $T^{3/4}$ ignoring log factors. We prove that this rate is optimal by presenting a surprising $T^{3/4}$ lower bound, which is the main technical contribution of the paper.[-]

We study repeated bilateral trade where an adaptive σ-smooth adversary generates the valuations of sellers and buyers. We provide a complete characterization of the regret regimes for fixed-price mechanisms under different feedback models in the two cases where the learner can post either the same or different prices to buyers and sellers. We begin by showing that the minimax regret after $T$ rounds is of order $\sqrt{T}$ in the full-feedback ...[+]

68W40 ; 91B24 ; 68W25

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The spectral properties of a singularly perturbed self-adjoint Landau Hamiltonian in the plane with a delta-potential supported on a finite curve are studied. After a general discussion of the qualitative spectral properties of the perturbed Landau Hamiltonian and its resolvent, one of our main objectives is a local spectral analysis near the Landau levels.
This talk is based on joint works with P. Exner, M. Holzmann, V. Lotoreichik, and G. Raikov.[-]

The spectral properties of a singularly perturbed self-adjoint Landau Hamiltonian in the plane with a delta-potential supported on a finite curve are studied. After a general discussion of the qualitative spectral properties of the perturbed Landau Hamiltonian and its resolvent, one of our main objectives is a local spectral analysis near the Landau levels.
This talk is based on joint works with P. Exner, M. Holzmann, V. Lotoreichik, and G. ...[+]

47A55 ; 47N50 ; 81Q10

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Let $\Omega \subset \mathbb{R}^3$ be a sheared waveguide, i.e., $\Omega$ is built by translating a cross-section (an arbitrary bounded connected open set of $\mathbb{R}^2$ ) in a constant direction along an unbounded spatial curve. Consider $-\Delta_{\Omega}^D$ the Dirichlet Laplacian operator in $\Omega$. Under the condition that the tangent vector of the reference curve admits a finite limit at infinity, we find the essential spectrum of $-\Delta_{\Omega}^D$. After that, we state sufficient conditions that give rise to a non-empty discrete spectrum for $-\Delta_{\Omega}^D$. Finally, in case the cross section translates along a broken line in $\mathbb{R}^3$, we prove that the discrete spectrum of $-\Delta_{\Omega}^D$ is finite, furthermore, we show a particular geometry for $\Omega$ which implies that the total multiplicity of the discrete spectrum is equals 1.[-]

Let $\Omega \subset \mathbb{R}^3$ be a sheared waveguide, i.e., $\Omega$ is built by translating a cross-section (an arbitrary bounded connected open set of $\mathbb{R}^2$ ) in a constant direction along an unbounded spatial curve. Consider $-\Delta_{\Omega}^D$ the Dirichlet Laplacian operator in $\Omega$. Under the condition that the tangent vector of the reference curve admits a finite limit at infinity, we find the essential spectrum of ...[+]

49R05 ; 47A75 ; 47F05

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Documents Hennenfent, Guillaume 2 207 résultats

Mathematical and numerical aspects of Lagrangian fluid mechanics - Després, Bruno (Auteur de la conférence) | CIRM H Nouveau

When he was one hundred years old! - Verdier, Norbert (Auteur de la conférence) | CIRM H Nouveau

Rational curves and contraction loci on symplectic manifolds - Amerik, Ekaterina (Auteur de la conférence) | CIRM H Nouveau

Connectivity of Markoff mod-p graphs - Fuchs, Elena (Auteur de la conférence) | CIRM H Nouveau

Billiards and number theory - McMullen, Curtis T. (Auteur de la conférence) | CIRM H Nouveau

Des mathématiques pour comprendre notre monde - 1 - Gander, Martin (Auteur de la conférence) | CIRM Nouveau

Des mathématiques pour comprendre notre monde - 2 - Gander, Martin (Auteur de la conférence) | CIRM Nouveau

Bilateral trade and two-sided markets - Leonardi, Stefano (Auteur de la conférence) | CIRM H Nouveau

The Landau Hamiltonian with delta-potentials supported on curves - Behrndt, Jussi (Auteur de la conférence) | CIRM H Nouveau

Spectral analysis in sheared waveguides - Verri, Alessandra (Auteur de la conférence) | CIRM H Nouveau