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Mathematics (40)

Lliçó inaugural 'Matemàtiques en temps difícils: El teorema de Corominas - Sunyer'. Vicenç Navarro
Lliçó inaugural "Matemàtiques en temps difícils: El teorema de Corominas - Sunyer". Vicenç Navarro
Catalan15 oct 202054Intervenció per part de Vicenç Navarro, dins de l'acte d'inauguració del curs acadèmic 2020-2021 de la Facultat de Matemàtiques i Informàtica de la Universitat de Barcelona a l'Aula Magna de l'Edifici Històric Central.
Xavier Jarque. Modelització matemàtica: Una eina efectiva contra la pandèmia
Xavier Jarque. Modelització matemàtica: Una eina efectiva contra la pandèmia
Catalan30 apr 2020199Una reflexió de Xavier Jarque, Professor de la Facultat de Matemàtiques i Informàtica.
Inmaculada Rodríguez. Les TICs i la intel·ligència artificial ens poden ajudar
Inmaculada Rodríguez. Les TICs i la intel·ligència artificial ens poden ajudar
Catalan20 apr 2020202Una reflexió d'Inmaculada Rodríguez, professora Titular del Departament de Matemàtiques i Informàtica.
MateFest InfoFest 2019
MateFest InfoFest 2019
Catalan27 may 2019411Celebració de la XX edició de la 'Matefest-Infofest'. Aquest és el nom de la festa organitzada pels estudiants de Matemàtiques i d'Enginyeria Informàtica de la Universitat de Barcelona que té com a objectiu apropar aquestes matèries als estudiants d'ESO i Batxillerat. Aquest esdeveniment té lloc a la mateixa Facultat de Matemàtiques i Informàtica de la Universitat l'11 d'abril de ...
Matefest Infofest 2018
Matefest Infofest 2018
Catalan25 apr 2018897Celebració de la XIX edició de la 'Matefest-Infofest'. Aquest és el nom de la festa organitzada pels estudiants de Matemàtiques i d'Enginyeria Informàtica de la Universitat de Barcelona que té com a objectiu apropar aquestes matèries als estudiants d'ESO i Batxillerat. Aquest esdeveniment té lloc a la mateixa Facultat de Matemàtiques i Informàtica de la Universitat el 18 d'abril de ...
Acte inaugural de l'exposició 'Els números i la humanitat'
Acte inaugural de l'exposició 'Els números i la humanitat'
Catalan18 jan 2018373Inauguració de l'exposició 'Els números i la humanitat', comissariada pel Dr. Javier Tejada, catedràtic de Física de l’Estat Sòlid de la Universitat de Barcelona, que va tenir lloc a l'Aula Magna de l'Edifici Històric de la UB el passat 11 de gener de 2018.
Exposició: Els números i la humanitat
Exposició: Els números i la humanitat
Catalan18 jan 2018438A partir del 10 de gener fins al 7 de febrer, de dilluns a divendres de 9 a 21h. al vestíbul de l’Edifici Històric de la Universitat de Barcelona, té lloc una exposició que consta de vint panells i 250 vinyetes, a més de quatre projectors que mostren en temps real els números que van registrant quaranta comptadors que quantifiquen a escala mundial aspectes com els naixements, les morts, ...
Microscopic Description of Systems of Points with Coulomb-type Interactions
Microscopic Description of Systems of Points with Coulomb-type Interactions
English5 sep 2017487We are interested in systems of points with Coulomb, logarithmic or Riesz interactions (i.e. inverse powers of the distance). They arise in various settings: an instance is the study of Fekete points in approximation theory, another is the classical log gas or Coulomb gas which in some cases happens to be a random matrix ensemble, another is vortices in superconductors, superfluids or ...
Completely Positive Semidefinite Matrices: Conic Approximations and Matrix Factorization Ranks
Completely Positive Semidefinite Matrices: Conic Approximations and Matrix Factorization Ranks
English5 sep 2017512The completely positive semidefinite cone is a new matrix cone, which consists of all the symmetric matrices (of a given size) that admit a Gram factorization by positive semidefinite matrices of any size. This cone can thus be seen as a non-commutative analogue of the classical completely positive cone, replacing factorizations by nonnegative vectors (aka diagonal psd matrices) by arbitrary ...
Structure Tensors
Structure Tensors
English5 sep 2017530We show that in many instances, at the heart of a problem in numerical computation sits a special 3-tensor, the structure tensor of the problem that uniquely determines its underlying algebraic structure. For example, the Grothendieck constant, which plays an important role in unique games conjecture and SDP relaxations of NP-hard problems, arises as the spectral norm of such a structure ...
Fourier-like Bases and Integrable Probability
Fourier-like Bases and Integrable Probability
English5 sep 2017560No information.Presentation by: Alexei Borodin. MIT, USA
Information Complexity and Applications
Information Complexity and Applications
English5 sep 2017543Over the past two decades, information theory has reemerged within computational complexity theory as a mathematical tool for obtaining unconditional lower bounds in a number of models, including streaming algorithms, data structures, and communication complexity. Many of these applications can be systematized and extended via the study of information complexity – which treats information ...
Adaptive High-Order Methods for Elliptic Problems: Convergence and Optimality
Adaptive High-Order Methods for Elliptic Problems: Convergence and Optimality
English5 sep 2017513Adaptive algorithms for h-type finite element discretizations of elliptic problems are by now well understood, as far as their convergence and optimality properties are concerned.The design and analysis of adaptive algorithms for hp-type discretizations poses new challenges. Indeed, the choice between applying a mesh refinement or a polynomial enrichment is a delicate stage in the ...
Dynamic Formulation of Optimal Transportation and Variational Relaxation of Euler Equations
Dynamic Formulation of Optimal Transportation and Variational Relaxation of Euler Equations
English5 sep 2017554We will briefly recall the classical Optimal Transportation Framework and its Dynamic relaxations. We will show the link between these Dynamic formulation and the so-called Multi-Marginal extension of Optimal Transportation. We will then describe the so-called Iterative Proportional Fitting Procedure (IPFP aka Sinkhorn method) which can be efficiently applied to the multi-marginal OT setting. ...
Variational Discretizations of Gauge Field Theories Using Group-Equivariant Interpolation Spaces
Variational Discretizations of Gauge Field Theories Using Group-Equivariant Interpolation Spaces
English5 sep 2017561Variational integrators are geometric structure-preserving numerical methods that preserve the symplectic structure, satisfy a discrete Noether's theorem, and exhibit exhibit excellent long-time energy stability properties. An exact discrete Lagrangian arises from Jacobi's solution of the Hamilton-Jacobi equation, and it generates the exact flow of a Lagrangian system. By approximating the ...
T < 4E
T < 4E
English5 sep 2017540Descartes proved that a graph embedding into the plane on V vertices and E edges ...
Large Graph Limits of Learning Algorithms
Large Graph Limits of Learning Algorithms
English5 sep 2017536Many problems in machine learning require the classification of high dimensional data. One methodology to approach such problems is to construct a graph whose vertices are identified with data points, with edges weighted according to some measure of affinity between the data points. Algorithms such as spectral clustering, probit classification and the Bayesian level set method can all be ...
Linear Differential Equations as a Data-Structure
Linear Differential Equations as a Data-Structure
English5 sep 2017502Many informations concerning solutions of linear differential equations can be computed directly from the equation. It is therefore natural to consider these equations as a data-structure, from which mathematical properties can be computed. A variety of algorithms has thus been designed in recent years that do not aim at "solving'', but at computing with this representation. The talk will ...
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