23/02/26 22:37:44.59 ZAlHQVD3.net
>>859
>乗数イデアル層の解明が進んだこの10年であった
ああ、ありがとう
乗数イデアル層が、重要キーワードなのか
「Siu による乗数イデアルを用いた巧妙な拡張定理の手法 [Si1] 」>>792 藤野
から、下記PDFがヒットしたので貼る
Y.-T. Siu, Invariance of plurigenera, Invent.Math. 134 (1998), no. 3, 661?673.
URLﾘﾝｸ(people.math.harvard.edu)
Invent. math. 134, 661-673 (1998)
DOI 10.1007/s002229800870
Invariance of plurigenera
Yum-Tong Siu*
Department of Mathematics, Harvard University, Cambridge, MA 02138, USA
P2
multiplier ideal sheaf
>>857再録
URLﾘﾝｸ(en.wikipedia.org)
Multiplier ideal
In commutative algebra, the multiplier ideal associated to a sheaf of ideals over a complex variety and a real number c consists (locally) of the functions h such that
|h|^2/Σ|fi^2|^c
is locally integrable, where the fi are a finite set of local generators of the ideal. Multiplier ideals were independently introduced by Nadel (1989) (who worked with sheaves over complex manifolds rather than ideals) and Lipman (1993), who called them adjoint ideals.
Multiplier ideals are discussed in the survey articles Blickle & Lazarsfeld (2004), Siu (2005), and Lazarsfeld (2009).
Algebraic geometry
In algebraic geometry, the multiplier ideal of an effective
Q -divisor measures singularities coming from the fractional parts of D. Multiplier ideals are often applied in tandem with vanishing theorems such as the Kodaira vanishing theorem and the Kawamata?Viehweg vanishing theorem.
Let X be a smooth complex variety and D an effective
Q -divisor on it. Let
μu :X'→ X be a log resolution of D (e.g., Hironaka's resolution).
(引用終り)
以上