| #### D.6.3.6 arnoldCorank Procedure from library `arnoldclassify.lib` (see arnoldclassify_lib). Usage: arnoldCorank(f); f poly Assume: basering is local, f in maxideal(2) has isolated critical point at 0 Return: corank of the Hessian matrix of f Example:
    LIB "arnoldclassify.lib";
    ring r=0,(x,y,z),ds;
    poly f=(x2+3y-2z)^2+xyz-(x-y3+x2*z3)^3;
    arnoldCorank(f);
    ==> 2

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