Accurate solution of polynomial equations using Macaulay resultant matrices
نویسندگان
چکیده
We propose an algorithm for solving two polynomial equations in two variables. Our algorithm is based on the Macaulay resultant approach, combined with new techniques including randomization to make the algorithm accurate in the presence of roundoff error. The ultimate computation is the solution of a generalized eigenvalue problem via the QZ method. We analyze the error due to roundoff of the method, showing that with high probability the roots are computed accurately, assuming that the input data (that is, the two polynomials) are well-conditioned. Our analysis requires a novel combination of algebraic and numerical techniques.
منابع مشابه
Multivariate subresultants using Jouanolou’s resultant matrices
Earlier results expressing multivariate subresultants as ratios of two subdeterminants of the Macaulay matrix are extended to Jouanolou’s resultant matrices. These matrix constructions are generalizations of the classical Macaulay matrices and involve matrices of significantly smaller size. Equivalence of the various subresultant constructions is proved. The resulting subresultant method improv...
متن کاملDeterminants of Modular Macaulay Matrices
Introduction: Resultants of multi-variate polynomials are fundamental for solving systems of polynomial equations and have numerous applications. Thus they are being intensely studied. Macaulay [3] showed that the projective resultant of a list of multi-variate polynomials is the quotient of two determinants. The numerator of this quotient is the determinant of a (sparse) matrix containing the ...
متن کاملConditions for Additional Roots from Maximal-Rank Minors of Macaulay Matrices
Necessary conditions, under which the maximal-rank minors of a (possibly singular) Macaulay matrix of a polynomial system vanish, are analyzed. It is shown that the vanishing of the maximal-rank minors of the Macaulay matrix of a system of parametric polynomials under specialization is a necessary condition for the specialized polynomials to have an additional common root even when the parametr...
متن کاملBack to the Roots – Polynomial System Solving Using Linear Algebra and System Theory
Abstract. We return to the algebraic roots of the problem of finding the solutions of a set of polynomial equations, and review this task from the linear algebra perspective. The system of polynomial equations is represented by a system of homogeneous linear equations by means of a structured Macaulay coefficient matrix multiplied by a vector containing monomials. Two properties are of key impo...
متن کاملMatrices in Elimination
The last decade has witnessed the rebirth of resultant methods as a powerful computational tool for variable elimination and polynomial system solving. In particular, the advent of sparse elimination theory and toric varieties has provided ways to exploit the structure of polynomials encountered in a number of scientiic and engineering applications. On the other hand, the Bezoutian reveals itse...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Math. Comput.
دوره 74 شماره
صفحات -
تاریخ انتشار 2005