“…In order to calculate I d,i 's using Theorem 3 we can proceed as follows: We use the Gröbner basis algorithm and find the irreducible components of the affine variety given by the ideal J d,1 , J d,2 , J d, 3 and among them identify the variety V d . In deg(J 2,1 ) = 42, deg(J 2,2 ) = 40, deg(J 2,3 ) = 69 and calculating the Gröbner basis of the ideal J d,1 , J d,2 , J d, 3 is a huge amount of computations.…”