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Iitaka dimension information


In algebraic geometry, the Iitaka dimension of a line bundle L on an algebraic variety X is the dimension of the image of the rational map to projective space determined by L. This is 1 less than the dimension of the section ring of L

The Iitaka dimension of L is always less than or equal to the dimension of X. If L is not effective, then its Iitaka dimension is usually defined to be or simply said to be negative (some early references define it to be −1). The Iitaka dimension of L is sometimes called L-dimension, while the dimension of a divisor D is called D-dimension. The Iitaka dimension was introduced by Shigeru Iitaka (1970, 1971).

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Iitaka dimension

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In algebraic geometry, the Iitaka dimension of a line bundle L on an algebraic variety X is the dimension of the image of the rational map to projective...

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Canonical ring

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Kodaira dimension of V. One can define an analogous ring for any line bundle L over V; the analogous dimension is called the Iitaka dimension. A line...

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Shigeru Iitaka

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University working in algebraic geometry who introduced the Kodaira dimension, and Iitaka dimension. He was a world leader in the field of Algebraic geometry....

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Kodaira dimension

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notation κ. Shigeru Iitaka extended it and defined the Kodaira dimension for higher dimensional varieties (under the name of canonical dimension), and later named...

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Mumford vanishing theorem

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Mumford in 1967 states that if L is a semi-ample invertible sheaf with Iitaka dimension at least 2 on a complex projective manifold, then H i ( X , L − 1 )...

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Glossary of algebraic geometry

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terminal" Kodaira dimension 1.  The Kodaira dimension (also called the Iitaka dimension) of a semi-ample line bundle L is the dimension of Proj of the section...

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Caucher Birkar

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old problem of Iitaka on effectivity of Iitaka fibrations induced by pluri-canonical systems on varieties of non-negative Kodaira dimension. The problem...

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Hodge conjecture

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(July 13–24, 1981). "What is known about the Hodge Conjecture?". In S. Iitaka (ed.). Advanced Studies in Pure Mathematics. Algebraic Varieties and Analytic...

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Yujiro Kawamata

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Kawamata used analytic methods in Hodge theory to prove the Iitaka conjecture over a base of dimension 1. More recently, a series of papers by Kawamata related...

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Kunihiko Kodaira

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the holomorphic tangent bundle, that carried the basic data about the dimension of the moduli space, and obstructions to deformations. This theory is...

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Algebraic curve

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Graduate Texts in Mathematics. Vol. 52. Springer. ISBN 978-1-4757-3849-0. Iitaka, Shigeru (2011) [1982]. Algebraic Geometry: An Introduction to Birational...

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Phases of ice

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space remains controversial owing to the aforementioned criticism raised by Iitaka. The infrared absorption spectra of ice XI was studied in 2009 in preparation...

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PreQ1 synthase

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PMID 15767583. Yokoyama S, Miyazawa T, Iitaka Y, Yamaizumi Z, Kasai H, Nishimura S (1979). "Three-dimensional structure of hyper-modified nucleoside Q...

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Polyhydride

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1080/02603594.2016.1196679. S2CID 99251100. Wang, H.; Tse, J. S.; Tanaka, K.; Iitaka, T.; Ma, Y. (6 April 2012). "Superconductive sodalite-like clathrate calcium...

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