target f
i1 : R = ZZ[x,y,z];
i2 : M = R^1/(x,y,z);
i3 : N = R^1/(x^2,y^2,x*y*z,z^2);
i4 : g = map(N,M,x*y); o4 : Matrix N <-- M
i5 : target g o5 = cokernel | x2 y2 xyz z2 | 1 o5 : R-module, quotient of R