Abstract
A concept of approximate factorization of multivariate polynomial is introduced and an algorithm for approximate factorization is presented. The algorithm handles polynomials with complex coefficients represented approximately, hence it can be used to test the absolute irreducibility of multivariate polynomials. The algorithm works as follows: given a monic square-free polynomialF(x,y,…,z), it calculates the roots ofF(x,y o , ...,z 0) numerically, wherey o, … z0 are suitably chosen numbers, then it constructs power series F1, …, Fn such thatF(x,y, …, z) ∈F1 (x,y., ...,z)...F n (x,y, ...z) (mod Se+2), where n=degx (F),S=(y-y 0, ...,z-z 0), ande=max{degy(F), …, degx (F)}; finally it finds the approximate divisors ofF as products of elements of {F 1, …,F n}.
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References
[Ber67] E.R. Berlekamp, Factorizing polynomials over finite fields. Bell System Tech. J.,46 (1967), 1853–1859.
[CG82] A.L. Chistov and D.Y. Grigor’ev, Polynomial-time factoring of multivariate polynomials over a global field. LOMI preprint, Leningrad, 1982.
[HS81] J. Heintz and M. Sieveking, Absolute primality of polynomials is decidable in random polynomial time in the number of variables. Proc. 1981 Intn’l Conf. on Automata, Languages and Programming, Lecture Notes in Comp. Sci., vol. 115, Springer, 1981, 16–28.
[Kal82a] E. Kaltofen, Factorization of polynomials. Computer Algebra: Symbolic and Algebraic Computation (eds. B. Buchberger, G.E. Collins, and R. Loos.), Springer-Verlag, 1982, 95–113.
[Kal82b] E. Kaltofen, A polynomial reduction from multivariate to bivariate integral polynomial factorization. Proc. 1982 ACM Symp. on Theory of Computation, 1982, 261–266
[Kal85] E. Kaltofen, Fast parallel absolute irreducibility testing. J. Symbolic Comput.,1 (1985), 57–67.
[Len84] A.K. Lenstra, Polynomial factorization by root approximation. Proc. EUROSAM’84, Lecture Notes in Comp. Sci. vol. 174, 1984, 272–276.
[LLL82] A.K. Lenstra, Jr., H.W. Lenstra and L. Lovász, Factoring polynomials with rational coefficients. Math. Ann.,261 (1982), 515–534.
[ONS91] M. Ochi, M-T. Noda and T. Sasaki, Approximate GCD of multivariate polynomials and application to ill-conditioned system of algebraic equations. (To appear in J. Inform. Process.,14 (1991).)
[SN89] T. Sasaki and M-T. Noda, Approximate square-free decomposition and root-finding of ill-conditioned algebraic equation. J. Inform. Process.,12 (1989), 159–168.
[SS90] T. Sasaki and M. Sasaki, Analysis of accuracy decreasing in polynomial remainder sequence with floating-point number coefficients. J. Inform. Process.,12 (1990), 394–403.
[SSH91] T. Sasaki, T. Saito and T. Hilano, 1991 (preprint of Univ. of Tsukuba).
[vdW37] B.L. van der Waerden, Moderne Algebra, vol. 1. Springer Verlag, 2nd edition, 1937. Translated into Japanese by K. Ginbayashi, Tokyo-Tosho, Tokyo, 1959.
[vzGK83] J. von zur Gathen and E. Kaltofen, A polynomial-time algorithm for factoring multivariate polynomials over finite fields. Proc. 1983 Intn’l Conf. on Automata, Languages and Programming, Lecture Notes in Comp. Sci., vol. 154, Springer, 1983, 250–263.
[WR75] P.S. Wang and L.P. Rothschild, Factoring multivariate polynomials over the integers. Math. Comp.,29 (1975), 935–950.
[WR76] P.J. Weinberger and L.P. Rothschild, Factoring polynomials over algebraic number fields. ACM Trans. Math. Software,2 (1976), 335–350.
[YNT90] K. Yokoyama, M. Noro and T. Takeshima, On factoring multi-variate polynomials over algebraically closed fields. Proc. 1990 Intn’l Symp. on Symbolic and Algebraic Computation. ACM, 1990, 297.
[Zas69] H. Zassenhaus, On Hensel factorization I. J. Number Theory,1 (1969), 291–311.
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Sasaki, T., Suzuki, M., Kolár, M. et al. Approximate factorization of multivariate polynomials and absolute irreducibility testing. Japan J. Indust. Appl. Math. 8, 357–375 (1991). https://doi.org/10.1007/BF03167142
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DOI: https://doi.org/10.1007/BF03167142