Fractional operators and special functions. II. Legendre functions

Details Fractional operators and special functions. II. Legendre functions Fractional operators and special functions. II. Legendre functions

2002-12-04

arxiv.org/abs/math-ph/0212019v2

Physics

Mathematical Physics

26 pages, Latex2e, reference corrected

Scientific paper

Most of the special functions of mathematical physics are connected with the representation of Lie groups. The action of elements $D$ of the associated Lie algebras as linear differential operators gives relations among the functions in a class, for example, their differential recurrence relations. In this paper, we apply the fractional generalizations $D^\mu$ of these operators developed in an earlier paper in the context of Lie theory to the group SO(2,1) and its conformal extension. The fractional relations give a variety of interesting relations for the associated Legendre functions. We show that the two-variable fractional operator relations lead directly to integral relations among the Legendre functions and to one- and two-variable integral representations for those functions. Some of the relations reduce to known fractional integrals for the Legendre functions when reduced to one variable. The results enlarge the understanding of many properties of the associated Legendre functions on the basis of the underlying group structure.

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