Function: _-_
Class: symbolic_operators
C-Name: gsub
Prototype: GG
Description: 
 (small, small):small:parens	$(1) - $(2)
 (lg, small):lg:parens	        $(1) - $(2)
 (int, small):int		subis($1, $2)
 (small, int):int		subsi($1, $2)
 (int, int):int	          	subii($1, $2)
 (real, small):real		subrs($1, $2)
 (small, real):real		subsr($1, $2)
 (real, real):real		subrr($1, $2)
 (mp, real):real		mpsub($1, $2)
 (real, mp):real	     	mpsub($1, $2)
 (mp, mp):mp	     	        mpsub($1, $2)
 (gen, small):gen		gsubgs($1, $2)
 (small, gen):gen		gsubsg($1, $2)
 (gen, gen):gen	  	        gsub($1, $2)

