Multiplicity of zeros and discrete orthogonal polynomials

Details Multiplicity of zeros and discrete orthogonal polynomials Multiplicity of zeros and discrete orthogonal polynomials

2002-04-25

arxiv.org/abs/math/0204317v1

Mathematics

Classical Analysis and ODEs

Scientific paper

We consider a problem of bounding the maximal possible multiplicity of a zero at of some expansions $\sum a_i F_i(x)$, at a certain point $c,$ depending on the chosen family $\{F_i \}$. The most important example is a polynomial with $c=1.$ It is shown that this question naturally leads to discrete orthogonal polynomials. Using this connection we derive some new bounds, in particular on the multiplicity of the zero at one of a polynomial with a prescribed norm.

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