| #### D.5.2.60 EulerAff Procedure from library `chern.lib` (see chern_lib). Usage: EulerAff(I); I an ideal Return: integer Purpose: computes the Euler characteristic of the affine variety defined by I Note: Example:
    LIB "chern.lib";
    ring r = 0, (x, y), dp;
    // compute the Euler characteristic of the affine elliptic curve y^2=x^3+x+1;
    ideal I=y2-x3-x-1;
    EulerAff(I);
    ==> -1

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