Summary
A partial result on a problem of Siegel is given: Hypergeometric functions with rational parameters have transcendental values in almost all algebraic points — up to some natural exceptions; these exceptions are the well-known algebraic functions and an (unexpected) second class of examples related to certain Shimura-curves.
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Wolfart, J. Werte hypergeometrischer funktionen. Invent Math 92, 187–216 (1988). https://doi.org/10.1007/BF01393999
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DOI: https://doi.org/10.1007/BF01393999