Transformations of algebraic Gauss hypergeometric functions

Details Transformations of algebraic Gauss hypergeometric functions Transformations of algebraic Gauss hypergeometric functions

2008-07-30

arxiv.org/abs/0807.4808v1

Mathematics

Classical Analysis and ODEs

25 pages

Scientific paper

A celebrated theorem of Klein implies that any hypergeometric differential equation with algebraic solutions is a pull-back of one of the few standard hypergeometric equations with algebraic solutions. The most interesting cases are hypergeometric equations with tetrahedral, octahedral or icosahedral monodromy groups. We give an algorithm for computing Klein's pull-back coverings in these cases, based on certain explicit expressions (Darboux evaluations) of algebraic hypergeometric functions. The explicit expressions can be computed using contiguous relations and a data base of simplest Darboux evaluations (covering the Schwarz table). Klein's pull-back transformations also induce algebraic transformations between hypergeometric solutions and a standard hypergeometric function with the same finite monodromy group.

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