Asymptotic behavior of Müntz orthogonal polynomials

Series: 
Analysis Seminar
Wednesday, January 20, 2010 - 14:00
1 hour (actually 50 minutes)
Location: 
Skiles 269
,  
Georgia Tech
Organizer: 
Müntz polynomials arise from consideration of Müntz's Theorem, which is a beautiful generalization of Weierstrass's Theorem. We prove a new surprisingly simple representation for the Müntz orthogonal polynomials on the interval of orthogonality, and in particular obtain new formulas for some of the classical orthogonal polynomials (e.g. Legendre, Jacobi, Laguerre). This allows us to determine the strong asymptotics on the interval, and the zero spacing behavior follows. This is the first time that such asymptotics have been obtained for general Müntz exponents. We also look at the asymptotic behavior outside the interval, and the asymptotic properties of the associated Christoffel functions.