Zeros of polynomials orthogonal with respect to a signed weight

Abstract

In this paper we consider the polynomial sequence $(P_n^{\alpha ,q}(x))$ that is orthogonal on $[-1,1]$ with respect to the weight function $x^{2q+1}(1-x^2{)}^{\alpha }(1-x),\alpha >-1,q\in \mathbb{N}$; we obtain the coefficients of the tree-term recurrence relation (TTRR) by using a different method from the one derived in \cite{kn:atia1}; we prove that the interlacing property does not hold properly for $(P_n^{\alpha ,q}(x))$; and we also prove that, if $x_{n,n}^{\alpha +i,q+j}$ is the largest zero of $P_n^{\alpha +i,q+j}(x)$, $x_{2n-2j,2n-2j}^{\alpha +j,q+j}<x_{2n-2i,2n-2i}^{\alpha +i,q+i},0\le i<j\le n-1$.

12 pages, 1 figure

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