Abstract
In this article we characterize the polynomial maps \(F:\mathbb {C}^n\rightarrow \mathbb {C}^n\) for which \(F^{-1}(0)\) is finite and their multiplicity \(\mu (F)\) is equal to \(n!\mathrm V_n(\widetilde{\Gamma }_{+}(F))\), where \(\widetilde{\Gamma }_{+}(F)\) is the global Newton polyhedron of F. As an application, we derive a characterization of those polynomial maps whose multiplicity is maximal with respect to a fixed Newton filtration.
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References
Artal Bartolo, E., Luengo, I.: On the topology of a generic fibre of a polynomial function. Commun. Algebra 28(4), 1767–1787 (2000)
Artal Bartolo, E., Luengo, I., Melle-Hernández, A.: Milnor number at infinity, topology and Newton boundary of a polynomial function. Math. Z. 233(4), 679–696 (2000)
Bivià-Ausina, C., Fukui, T., Saia, M.J.: Newton graded algebras and the codimension of non-degenerate ideals. Math. Proc. Camb. Philos. Soc. 133, 55–75 (2002)
Bivià-Ausina, C., Huarcaya, J.A.C.: The special closure of polynomial maps and global non-degeneracy, Mediterr. J. Math. 14(2), Art. 71 (2017)
Bivià-Ausina, C., Huarcaya, J.A.C.: Growth at infinity and index of polynomial maps. J. Math. Anal. Appl. 422, 1414–1433 (2015)
Broughton, S.A.: Milnor numbers and the topology of polynomial hypersurfaces. Invent. Math. 92(2), 217–241 (1988)
Cima, A., Gasull, A., Mañosas, F.: Injectivity of polynomial local homeomorphisms of $\mathbb{R}^n$. Nonlinear Anal. 26(4), 877–885 (1996)
Cox, D., Little, J., O’Shea, D.: Using Algebraic Geometry, Graduate Texts in Mathematics, vol. 185, 2nd edn. Springer, Berlin (2005)
Cygan, E., Krasiński, T., Tworzewski, P.: Separation of algebraic sets and the Łojasiewicz exponent of polynomial mappings. Invent. Math. 136(1), 75–87 (1999)
Furuya, M., Tomari, M.: A characterization of semi-quasihomogeneous functions in terms of the Milnor number. Proc. Am. Math. Soc. 132(7), 1885–1889 (2004)
Grothendieck, A.: Éléments de géométrie algébrique. IV. Étude locale des schémas et des morphismes de schémas. III. Inst. Hautes Études Sci. Publ. Math 28, 255 (1966)
Hà Huy, V., Zaharia, A.: Families of polynomials with total Milnor number constant. Math. Ann. 304(3), 481–488 (1996)
Hochster, M.: Rings of invariants of tori, Cohen-Macaulay rings generated by monomials, and polytopes. Ann. Math. (2) 96, 318–337 (1972)
Huneke, C., Swanson, I.: Integral Closure of Ideals, Rings, and Modules. London Math. Soc. Lecture Note Series 336. Cambridge University Press, Cambridge (2006)
Kouchnirenko, A.G.: Polyèdres de Newton et nombres de Milnor. Invent. Math. 32, 1–31 (1976)
Li, T.Y., Wang, X.: The BKK root count in $\mathbb{C}^n$. Math. Comput. 65(216), 1477–1484 (1996)
Matsumura, H.: Commutative Ring Theory. Cambridge Studies in Advanced Mathematics 8, Cambridge University Press, Cambridge (1986)
Rojas, J.M.: A convex geometric approach to counting the roots of a polynomial system. Theor. Comput. Sci. 133(1), 105–140 (1994)
Saia, M.J.: Pre-weighted homogeneous map germs-finite determinacy and topological triviality. Nagoya Math. J. 151, 209–220 (1998)
Vasconcelos, W.: Integral Closure. Rees Algebras, Multiplicities, Algorithms. Springer Monographs in Mathematics. Springer, Berlin (2005)
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Communicated by A. Constantin.
Carles Bivià-Ausina was partially supported by DGICYT Grant MTM2015-64013-P. Jorge A. C. Huarcaya was partially supported by FAPESP-BEPE 2012/22365–8.
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Bivià-Ausina, C., Huarcaya, J.A.C. Polynomial maps with maximal multiplicity and the special closure. Monatsh Math 188, 413–429 (2019). https://doi.org/10.1007/s00605-018-1204-9
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DOI: https://doi.org/10.1007/s00605-018-1204-9