Arithmetic and Geometry Around Hypergeometric Functions

Volume 260 of the series Progress in Mathematics pp 287-312

Algebraic Values of Schwarz Triangle Functions

  • Hironori ShigaAffiliated withInst. of Math. and Physics, Chiba University
  • , Jürgen WolfartAffiliated withMath. Sem. der Univ.

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We consider Schwarz maps for triangles whose angles are rather general rational multiples of π. Under which conditions can they have algebraic values at algebraic arguments? The answer is based mainly on considerations of complex multiplication of certain Prym varieties in Jacobians of hypergeometric curves. The paper can serve as an introduction to transcendence techniques for hypergeometric functions, but contains also new results and examples.


Schwarz triangle functions hypergeometric functions algebraic values transcendence complex multiplication