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Harmonic functions on multiplicative graphs and interpolation polynomials
We construct examples of nonnegative harmonic functions on certain graded
graphs: the Young lattice and its generalizations. Such functions first emerged
in harmonic analysis on the infinite symmetric group. Our method relies on
multivariate interpolation polynomials associated with Schur's S and P
functions and with Jack symmetric functions. As a by-product, we compute
certain Selberg-type integrals.Comment: AMSTeX, 35 page
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