On Wed, 23 Mar 2022, 13:57 Nathan Dunfield, <nat...@dunfield.info> wrote:

> Mathematica, Maple, and numpy all use "arctanh"; MATLAB uses "atanh".


atanh, etc., i.e. just "a-"-prefix is well in line with the tradition of
Fortran libraries,
as well as C libm's.


It's "arctanh" in the NIST Digital Library of Mathematical Functions as
> well:
>
> https://dlmf.nist.gov/4.37
>
> It is the case that "ar-" prefix is the current ISO standard, and per the
> Wikipedia talk page the "ar-" prefix is more common in the non-English
> literature, but I'm not aware of any computer algebra system that uses it.
> So I would not support changing away from "arc-" as the default.
>
> Best wishes,
>
> Nathan
>
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