@node atan
@section @code{atan}
@findex atan

POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9699919799/functions/atan.html}

Gnulib module: atan

Portability problems fixed by Gnulib:
@itemize
@end itemize

Portability problems not fixed by Gnulib:
@itemize
@end itemize
