About the operator creating secondary polynomials

Details About the operator creating secondary polynomials About the operator creating secondary polynomials

2011-04-16

arxiv.org/abs/1104.3218v1

Mathematics

Classical Analysis and ODEs

14 pages

Scientific paper

We are studying here the classical operator creating secondary polynomials associated with an orthogonal system for a continuous probability density function on a real interval. We know it is possible with the coupling of Stietjes Transforms to build an auxiliary measure also called secondary measure, making associated polynomials orthogonal. One of the consequences of this definition is the possibility to extend this operator to a function having interesting isometric characters. Under some hypotheses, there appears in the construction of the secondary measure a function having a privileged role which we will develop here: we will call it the reducer which will enable us among other kings to reverse the studied extension and to make its adjunct explicit. We will also illustrate it, in the case of classical orthogonal polynomials with a few results on the Fourier's coefficients of this reducer with different numerical applications.

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