Singular Manual: zeroNcfrac

| ##### 7.5.14.0. 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)
    ==>

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