SINGULAR / A Computer Algebra System for Polynomial Computations / version 1-3-8 0< by: G.-M. Greuel, G. Pfister, H. Schoenemann \ May 2000 FB Mathematik der Universitaet, D-67653 Kaiserslautern \ ///////////////////////////////////////////////////////////////////////// // // This calculation proceeds in positive characteristic, rather than // characteristic zero. Since we do find that the eliminant has degree // 320, the Shape Lemma holds and so the ideal is reduced if and only // if the eliminant has no repeated factors. We show that it does not. // // Our conclusion for characteristic zero uses the contrapositive of // {Multiple solutions of an ideal in characteristic zero} // ====> // {Multiple solutions in any reduction of that ideal} // ///////////////////////////////////////////////////////////////////////// // // We set up the rings and the ideal // ///////////////////////////////////////////////////////////////////////// // // We compute the Groebner basis of the this ideal // // The ideal has degree 320 and dimension 0 // codimension = 6 // dimension = 0 // degree = 320 // This is the time for the first Groebner basis calculation 65 // Now we compute an eliminant using fglm, it will be H[1] // The eliminant has degree 320 // codimension = 1 // dimension = 5 // degree = 320 // We compute the ideal of the eliminant and its first derivative // Since this is the unit ideal, the eliminant has no repeated factors // and thus the original ideal is reduced. _[1]=1 // This is the time for the full calculation 74 Auf Wiedersehen.