Mathematics tools

Thanks for clarifying this. On our experimental Moodle instance this works:

texput("signum","\\mathrm{signum}");

Yet, we still have problems with reliable math formatting. 

Indeed, in wxmaxima, the tex function doesn't know that signum should be roman. 

It would perhaps be a good idea to rename signum(x) to sgn(x) in STACK with proper tex formatting, because sgn() seems to be the accepted way to write the function outside Maxima. Perhaps this could use the same mechanism like thehandling of alternate names for trig functions.