Mathematics – Algebraic Geometry
Scientific paper
2004-08-28
Duke Math. J. 133 (2006), 347-390.
Mathematics
Algebraic Geometry
35 pages, final version. To appear in Duke Math. J
Scientific paper
We investigate conditions for "simultaneous normalizability" of a family of reduced schemes, i.e., the normalization of the total space normalizes, fiber by fiber, each member of the family. The main result (under more general conditions) is that a flat family of reduced equidimensional projective complex varieties X_y with parameter y ranging over a normal space--algebraic or analytic--admits a simultaneous normalization if and only if the Hilbert polynomial of the integral closure of the structure sheaf O_{X_y} is locally independent of y. When the X_y are curves projectivity is not needed, and the statement reduces to the well known \delta-constant criterion of Teissier. Proofs are basically algebraic, analytic results being related via standard techniques (Stein compacta, etc.) to more abstract algebraic ones.
Chiang-Hsieh Hung-Jen
Lipman Joseph
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