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> There is no logic in having sinh but not asinh. Therefore Lua should
> provide asinh, acosh and atanh. These functions are the staple of
> any first-year calculus student and are called "elementary" in books
> about mathematical functions.

I must confess that I did an entire course of Eletrical Engineering
and have no recollection of ever met them. Maybe it is just my memory...

> To assist the team, here are the functions ready-coded in C89.
> These versions have been in use (by me only, AFAIK, although
> they are on my GitHub site in a package that I have not advertised)
> for more than a year.

If those definitions are good enough, they can easily be implemented
in Lua itself by those that need them.

-- Roberto