Mathematics – Classical Analysis and ODEs
Scientific paper
2007-11-12
Mathematics
Classical Analysis and ODEs
11 pages
Scientific paper
Given $\{P_n \}$ a sequence of monic orthogonal polynomials, we analyze their linear combinations $\{Q_n \}$with constant coefficients and fixed length $k+1$. Necessary and sufficient conditions are given for the orthogonality of the monic sequence $\{Q_n \}$ as well as an interesting interpretation in terms of the Jacobi matrices associated with $\{P_n \}$ and $\{Q_n \}$. Moreover, in the case $k=2$, we characterize the families $\{P_n \}$ such that the corresponding polynomials $\{Q_n \}$ are also orthogonal.
Alfaro Manual
Marcellan Francisco
Pena Alejandro A.
Rezola M. L.
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