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

Usage:
zeroNcfrac(loc), ncloc loc

Purpose:
returns the zero fraction in the localization loc

Return:
ncfrac

Example:
 
LIB "ncfrac.lib";
==> // ** redefining testNcfrac (LIB "ncfrac.lib";) ./examples/zeroNcfrac.sin\
   g: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-53,y-7);
zeroNcfrac(loc);
==> left repr.: (1,0)
==> right repr.: (0,1)
==>