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- W3159807883 abstract "We define an infinite sequence of generalizations, parametrized by an integer $m ge 1$, of the Stieltjes--Rogers and Thron--Rogers polynomials; they arise as the power-series expansions of some branched continued fractions, and as the generating polynomials for $m$-Dyck and $m$-Schroder paths with height-dependent weights. We prove that all of these sequences of polynomials are coefficientwise Hankel-totally positive, jointly in all the (infinitely many) indeterminates. We then apply this theory to prove the coefficientwise Hankel-total positivity for combinatorially interesting sequences of polynomials. Enumeration of unlabeled ordered trees and forests gives rise to multivariate Fuss--Narayana polynomials and Fuss--Narayana symmetric functions. Enumeration of increasing (labeled) ordered trees and forests gives rise to multivariate Eulerian polynomials and Eulerian symmetric functions, which include the univariate $m$th-order Eulerian polynomials as specializations. We also find branched continued fractions for ratios of contiguous hypergeometric series ${}_r ! F_s$ for arbitrary $r$ and $s$, which generalize Gauss' continued fraction for ratios of contiguous ${}_2 ! F_1$; and for $s=0$ we prove the coefficientwise Hankel-total positivity. Finally, we extend the branched continued fractions to ratios of contiguous basic hypergeometric series ${}_r ! phi_s$." @default.
- W3159807883 created "2021-05-10" @default.
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- W3159807883 date "2018-07-09" @default.
- W3159807883 modified "2023-09-27" @default.
- W3159807883 title "Lattice paths and branched continued fractions: An infinite sequence of generalizations of the Stieltjes--Rogers and Thron--Rogers polynomials, with coefficientwise Hankel-total positivity" @default.
- W3159807883 hasPublicationYear "2018" @default.
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