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José Manuel Marco

Publications and source records attributed to José Manuel Marco.

4 recordsLinked to original sources
arXiv2005

Taylor series for the Askey-Wilson operator and classical summation formulas

An analogue of Taylor's formula, which arises by substituting the classical derivative by a divided difference operator of Askey-Wilson type, is developed here. We study the convergence of the associated Taylor series. Our results complement a recent work by Ismail and Stanton. Quite surprisingly, in some cases the Taylor polynomials converge to a function which differs from the original one. We provide explicit expressions for the integral remainder. As application, we obtain some summation formulas for basic hypergeometric series. As far as we know, one of them is new. We conclude by studying the different forms of the binomial theorem in this context.

math.CA↗
arXiv2004

A new approach to the theory of classical hypergeometric polynomials

In this paper we present a unified approach to the spectral analysis of an hypergeometric type operator whose eigenfunctions include the classical orthogonal polynomials. We write the eigenfunctions of this operator by means of a new Taylor formula for operators of Askey-Wilson type. This gives rise to some expressions for the eigenfunctions, which are unknown in such a general setting. Our methods also give a general Rodrigues formula from which several well known formulas of Rodrigues type can be obtained directly. Moreover, other new Rodrigues type formulas come out when seeking for regular solutions of the associated functional equations. The main difference here is that, in contrast with the formulas appearing in the literature, we get non-ramified solutions which are useful for applications in combinatorics. Another fact, that becomes clear in this paper, is the role played by the theory of elliptic functions in the connection between ramified and non-ramified solutions.

math.CO↗
arXiv2003

On the natural representation of $S(Ω)$ into $L^2(P(Ω))$: Discrete harmonics and Fourier transform

Let $Ω$ denote a non-empty finite set. Let $S(Ω)$ stand for the symmetric group on $Ω$ and let us write $P(Ω)$ for the power set of $Ω$. Let $ρ: S(Ω) \to U(L^2(P(Ω)))$ be the left unitary representation of $S(Ω)$ associated with its natural action on $P(Ω)$. We consider the algebra consisting of those endomorphisms of $L^2(P(Ω))$ which commute with the action of $ρ$. We find an attractive basis $B$ for this algebra. We obtain an expression, as a linear combination of $B$, for the product of any two elements of $B$. We obtain an expression, as a linear combination of $B$, for the adjoint of each element of $B$. It turns out the Fourier transform on $P(Ω)$ is an element of our algebra; we give the matrix which represents this transform with respect to $B$.

math.CO↗