[texhax] signum(x) function?

John Wheeler jcw at chemj2.ucsd.edu
Sun Aug 24 07:24:11 CEST 2003

Can someone tell me if there is a LaTeX or AMSLaTeX function for
signum(x), the algebraic sign of x?  I expected \sgn{x}, but that gives an
error.  I've looked in the standard places,
(Lamport, Kopla and Daly, and Gr"{a}tzer)
but to no avail.  
I tried \sgn, \signum, and \sign, but all are undefined.

I got by with (using the package amsmath

but would rather follow LaTeX convention if there is one.
John Wheeler
jcw at chemj2.ucsd.edu

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