Robuta

https://pbase.com/ehansmann/image/159705733 Bill_Hanley_ATSF_Bx12.jpg photo - Eric H photos at pbase.com https://functions.wolfram.com/HypergeometricFunctions/Hypergeometric2F1/03/12/36/34/0005/ Gauss hypergeometric function 2F1: Specific values (formula 07.23.03.bx12) gauss hypergeometric function specific