Mathematica, Maple, and numpy all use "arctanh"; MATLAB uses "atanh". 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 -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/sage-devel/947becfa-9b63-4973-b046-1e9e20fb8c63n%40googlegroups.com.
