The zeta Fuchsians are class of functions discovered by Poincaré which are related to the automorphic functions.
Zeta Fuchsian
See also
Automorphic FunctionExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Zeta Fuchsian." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/ZetaFuchsian.html