[Octave-bug-tracker] [bug #60055] regarding to bug #15872: atanh branch cut strangeness

[Markus Mützel]

Follow-up Comment #5, bug #60055 (project octave):

AFAIU, there is no "one principal value" of atanh. But it's possible to define
a principal value that best fits ones needs. See e.g. [1].

While Wikipedia is no standardization source, they do describe the principal
value that Octave chose to use (to be compatible with Matlab) first. The
definition you propose is described second as being used by "some authors".

[1]:
https://en.wikipedia.org/wiki/Inverse_hyperbolic_functions#Principal_values_of_the_inverse_hyperbolic_tangent_and_cotangent

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