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Multivariate discriminant and iterated resultant
Authors:Jing Jun Han
Institution:School of Mathematical Sciences & Beijing International Center for Mathematical Research, Peking University, Beijing 100871, P. R. China
Abstract:In this paper, we study the relationship between iterated resultant and multivariate discriminant. We show that, for generic form f(x n ) with even degree d, if the polynomial is squarefreed after each iteration, the multivariate discriminant Δ(f) is a factor of the squarefreed iterated resultant. In fact, we find a factor Hp(f, x 1,...,x n]) of the squarefreed iterated resultant, and prove that the multivariate discriminant Δ(f) is a factor of Hp(f, x 1,...,x n]). Moreover, we conjecture that Hp(f, x 1,...,x n]) = Δ(f) holds for generic form f, and show that it is true for generic trivariate form f(x, y, z).
Keywords:Cylindrical algebraic decomposition  semi-definiteness  polynomial  resultant  multivariate discriminant  
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