| ##### 7.5.21.0. areEqualLeftFractions Procedure from library `olga.lib` (see olga_lib). Usage: areEqualLeftFractions(a, b, locType, locData), vector a, b, int locType, list/vector/intvec locData Purpose: check if two given fractions are equal Assume: Return: int Note: returns 1 or 0, depending whether a=b as fractions in the localization specified by locType and locData Example:
    LIB "olga.lib";
    ring R = 0,(x,y,Dx,Dy),dp;
    def S = Weyl();
    setring S; S;
    ==> // coefficients: QQ considered as a field
    ==> // number of vars : 4
    ==> //        block   1 : ordering dp
    ==> //                  : names    x y Dx Dy
    ==> //        block   2 : ordering C
    ==> // noncommutative relations:
    ==> //    Dxx=x*Dx+1
    ==> //    Dyy=y*Dy+1
    // monoidal
    poly g1 = x*y+3;
    poly g2 = y^3;
    list L = g1,g2;
    poly s1 = g1;
    poly s2 = s1*g2;
    poly s3 = s2;
    poly r1 = Dx;
    poly r2 = g2*r1;
    poly r3 = s1*r1+3;
    vector fracm1 = [s1,r1,0,0];
    vector fracm2 = [s2,r2,0,0];
    vector fracm3 = [s3,r3,0,0];
    areEqualLeftFractions(fracm1, fracm2, 0, L);
    ==> 1
    areEqualLeftFractions(fracm1, fracm3, 0, L);
    ==> 0
    areEqualLeftFractions(fracm2, fracm3, 0, L);
    ==> 0

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