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Transactions of the American Mathematical Society

Published by the American Mathematical Society since 1900, Transactions of the American Mathematical Society is devoted to longer research articles in all areas of pure and applied mathematics.

ISSN 1088-6850 (online) ISSN 0002-9947 (print)

The 2020 MCQ for Transactions of the American Mathematical Society is 1.48.

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Length, multiplicity, and multiplier ideals
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by Tommaso de Fernex PDF
Trans. Amer. Math. Soc. 358 (2006), 3717-3731 Request permission

Abstract:

Let $(R,\mathfrak {m})$ be an $n$-dimensional regular local ring, essentially of finite type over a field of characteristic zero. Given an $\mathfrak {m}$-primary ideal $\mathfrak {a}$ of $R$, the relationship between the singularities of the scheme defined by $\mathfrak {a}$ and those defined by the multiplier ideals $\mathcal {J}(\mathfrak {a}^c)$, with $c$ varying in $\mathbb {Q}_+$, are quantified in this paper by showing that the Samuel multiplicity of $\mathfrak {a}$ satisfies $e(\mathfrak {a}) \ge (n+k)^n/c^n$ whenever $\mathcal {J}(\mathfrak {a}^c) \subseteq \mathfrak {m}^{k+1}$. This formula generalizes an inequality on log canonical thresholds previously obtained by Ein, Mustaţǎ and the author of this paper. A refined inequality is also shown to hold for small dimensions, and similar results valid for a generalization of test ideals in positive characteristics are presented.
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Additional Information
  • Tommaso de Fernex
  • Affiliation: Department of Mathematics, University of Michigan, East Hall, 525 East University Avenue, Ann Arbor, Michigan 48109-1109
  • Address at time of publication: School of Mathematics, Institute for Advanced Study, 1 Einstein Drive, Princeton, New Jersey 08540
  • MR Author ID: 635850
  • Email: defernex@umich.edu, defernex@math.ias.edu
  • Received by editor(s): June 21, 2004
  • Received by editor(s) in revised form: September 20, 2004
  • Published electronically: March 24, 2006
  • Additional Notes: The author’s research was partially supported by the University of Michigan Rackham Research Grant and Summer Fellowship, and by the MIUR of the Italian Government in the framework of the National Research Project “Geometry on Algebraic Varieties" (Cofin 2002)
  • © Copyright 2006 American Mathematical Society
    The copyright for this article reverts to public domain 28 years after publication.
  • Journal: Trans. Amer. Math. Soc. 358 (2006), 3717-3731
  • MSC (2000): Primary 14B05; Secondary 13H05, 14B07, 13H15
  • DOI: https://doi.org/10.1090/S0002-9947-06-03862-1
  • MathSciNet review: 2218996