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Name:

atanh the hyperbolic arctangent function.

Library names:

sollya_obj_t sollya_lib_atanh(sollya_obj_t) sollya_obj_t sollya_lib_build_function_atanh(sollya_obj_t) #define SOLLYA_ATANH(x) sollya_lib_build_function_atanh(x)

Description:

atanh is the inverse of the function tanh: atanh(y) is the unique number x in [-Inf; +Inf] such that tanh(x)=y.
It is defined only for y in [-1; 1].