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Discrete Painlevé equations and orthogonal polynomials

Discrete Painlevé equations and orthogonal polynomials

Released Wednesday, 17th July 2013
Good episode? Give it some love!
Discrete Painlevé equations and orthogonal polynomials

Discrete Painlevé equations and orthogonal polynomials

Discrete Painlevé equations and orthogonal polynomials

Discrete Painlevé equations and orthogonal polynomials

Wednesday, 17th July 2013
Good episode? Give it some love!
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van Assche, W (Katholieke Universiteit Leuven)Friday 12 July 2013, 14:00-14:30

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The theory of (ordinary and partial) differential equations is well-established and to some extent standardised. By contrast, the theory of difference equations, while more fundamental, has until recently been in its infancy, in spite of a major effort at the beginning of the 20th Century by N"orlund and the school of G.D. Birkhoff to establish the linear theory. Discrete systems can appear in two main guises: in the first case the independent variable is discrete, taking values on a lattice (e.g. finite-difference equations, such as recurrence relations and dynamical mappings), in the second case the independent variable is continuous (e.g. analytic difference equations and even functional equations).Very recently, however, mainly through advances in the theory of exactly integrable discrete systems and the theory of (linear and nonlinear) special functions, the study of difference equations has undergone a true revolution. For the first time good and interesting examples of nonlinear difference equations admitting exact, albeit highly nontrivial, solutions were found and this has led to the formulation of novel approaches to the classification and treatment of such equations. Thus, an area has developed where several branches of mathematics and physics, that are usually distinct, come together: complex analysis, algebraic geometry, representation theory, Galois theory, spectral analysis and the theory of special functions, graph theory, and difference geometry.Read more at: www.newton.ac.uk/programmes/DIS/

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