A Poincaré-Fuchs-Klein automorphic function is defined by
where .
A Poincaré-Fuchs-Klein automorphic function is defined by
where .
Weisstein, Eric W. "Poincaré-Fuchs-Klein Automorphic Function." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/Poincare-Fuchs-KleinAutomorphicFunction.html