Singular Manual: invertAlgebraMorphism

| #### D.15.26.10 invertAlgebraMorphism Procedure from library `VecField.lib` (see VecField_lib). Usage: invertAlgebraMorphism(map p,int n), where p is an algebra morphism k[x1,...,xn]->k[y1,...,ym], or invertAlgebraMorphism(ideal p,int n) if you represent the map as an ideal Return: the inverse of p mod (maxideal)^n. If n=-1, try for infinite precision. If input was an ideal, return an ideal. Note: the algorithm used is described in [1], chapter 3.2 Example:
    LIB "VecField.lib";
    ring r = 0, (x, y, z),ds;
    vector v = [-1,-1,-1];
    VecField V = v;
    V.precision = 4;
    map phi = r, x-2y2+z3,2y+y3+z,z;
    map phiinv = invertAlgebraMorphism(phi,4);

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