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7.5.15.0. hasLeftDenom
Procedure from library ncfrac.lib (see ncfrac_lib).

Usage:
hasLeftDenom(frac), ncfrac frac

Purpose:
checks if frac has a left representation

Return:
int, 1 if frac has a left representation, 0 otherwise

Example:
 
LIB "ncfrac.lib";
==> // ** redefining testNcfrac (LIB "ncfrac.lib";) ./examples/hasLeftDenom.s\
   ing:1
==> // ** redefining testNcloc (    LIB "ncloc.lib";) ncfrac.lib::mod_init:11\
   3
ring R = 0,(x,y,Dx,Dy),dp;
def S = Weyl();
setring S;
ncloc loc = ideal(x-3,y+7);
ncfrac noLeft = list([0,0,3*y*Dx,x+2], loc);
hasLeftDenom(noLeft);
==> 0
ncfrac left = list([1,Dx,Dx,1], loc);
hasLeftDenom(left);
==> 1