Abstract (EN):
We bring a new proof for showing that an orthogonal polynomial sequence is classical if and only if any of its polynomial fulfils a certain differential equation of order 2k, for some k >= 1. So, we build those differential equations explicitly. If k = 1, we get the Bochner's characterization of classical polynomials. With help of the formal computations made in Mathematica, we explicitly give those differential equations for k = 1, 2 and 3 for each family of the classical polynomials. Higher order differential equations can be obtained similarly.
Language:
English
Type (Professor's evaluation):
Scientific
Contact:
anafsl@fc.up.pt; maroni@ann.jussieu.fr; mrdioh@fc.up.pt
No. of pages:
23