Cylinders in weak del pezzo fibrations

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August undefined, 2024

WebCylinders in projective varieties play an important role in connection with unipotent group actions on certain affine algebraic varieties. The previous work due to Dubouloz and Kishimoto deals with the condition for a del Pezzo fibration to contain a vertical cylinder. In the present work, as a generalization in the sense of singularities, we shall determine the … WebApr 21, 2016 · For each del Pezzo surface with du Val singularities, we determine whether it admits a -polar cylinder or not. If it allows one, then we present an effective -divisor that is -linearly equivalent to and such that the open set is a cylinder.

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WebDec 18, 2024 · Cylinders in canonical del Pezzo fibrations Masatomo Sawahara Cylinders in projective varieties play an important role in connection with unipotent group actions on certain affine algebraic varieties. The previous work due to Dubouloz and Kishimoto deals with the condition for a del Pezzo fibration to contain a vertical cylinder. WebMar 30, 2024 · We establish two results on three-dimensional del Pezzo fibrations in positive characteristic. First, we give an explicit bound for torsion index of relatively torsion line bundles. Second, we show the existence of purely inseparable sections with explicit bounded degree. ... Schröer, S., Weak del Pezzo surfaces with irregularity, Tohoku Math ... list of foods with hidden sugars

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WebJul 27, 2000 · CYLINDERS IN WEAK DEL PEZZO FIBRATIONS Article Full-text available Apr 2024 TRANSFORM GROUPS Masatomo Sawahara View Show abstract Birational rigidity and K-stability of Fano hypersurfaces with... WebCYLINDERS IN WEAK DEL PEZZO FIBRATIONS MASATOMO SAWAHARA Abstract. In this article, we shall look into the existence of vertical cylinders contained in a weak del … WebSep 6, 2024 · Del Pezzo surfaces are one of the most investigated subjects in the classical algebraic geometry. A smooth surface S is called a del Pezzo surface if its anti-canonical divisor -K_S is ample, and it is of degree d if the self-intersection number (-K_S)^2 is d. The degree d is an integer from 1 to 9, as is well known. imaginext toy story just4fun290

Transformation Groups Volume 28, issue 1 - Springer

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WebIn all cases, these surfaces satisfy weak approximation (assuming they have a point). July 24th: Showed that del Pezzo surfaces of degree 5 always have a rational point and are birational to the plane, over the ground field. Introduced the Azumaya Brauer group and the cohomological Brauer group (which coincide for nice varieties). WebIn this article, we shall look into the existence of vertical cylinders contained in a weak del Pezzo fibration as a generalization of the former work due to Dubouloz and Kishimoto in … list of foods with latex in themWebIn this paper we describe stable rank two bundles on Del-Pezzo fibrations of degree 1 and 2 exploiting the correspondence with the lines in fibers. We show ... CYLINDERS IN WEAK DEL PEZZO FIBRATIONS. 13 April 2024. MASATOMO SAWAHARA. Extending rationally connected fibrations from ample subvarieties. 09 July 2024. imaginext toys r us uk

"WebSep 5, 2012 · Cylinders in singular del Pezzo surfaces Ivan Cheltsov, Jihun Park and Joonyeong Won Compositio Mathematica Published online: 21 April 2016 Article Some extremal contractions between smooth varieties arising from projective geometry Alberto Alzati and Francesco Russo Proceedings of the London Mathematical Society Published … " - Cylinders in weak del pezzo fibrations

Cylinders in weak del pezzo fibrations

ON DEL PEZZO FIBRATIONS IN POSITIVE CHARACTERISTIC

WebApr 13, 2024 · In this article, we shall look into the existence of vertical cylinders contained in a weak del Pezzo fibration as a generalization of the former work of Dubouloz and … WebApr 18, 2024 · We show that a del Pezzo fibration π: V → W of degree d contains a vertical open cylinder, that is, an open subset whose intersection with the generic fiber of π is isomorphic to Z × AK1 for some quasi-projective variety Z defined over the function field K of W, if and only if d ≥ 5 and π: V → W admits a rational section.

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WebJul 4, 2016 · We show that a del Pezzo fibration π: V → W of degree d contains a vertical open cylinder, that is, an open subset whose intersection with the generic fiber of π is … WebCYLINDERS IN WEAK DEL PEZZO FIBRATIONS MASATOMO SAWAHARA Abstract. In this article, we shall look into the existence of vertical cylinders contained in a weak del Pezzo ﬁbration as a generalization of the former work due to Dubouloz and Kishimoto in which they observed that of vertical cylinders found in del Pezzo ﬁbrations. The …

WebOct 28, 2010 · We classify all the effective anticanonical divisors on weak del Pezzo surfaces. Through this classification we obtain the smallest number among the log canonical thresholds of effective anticanonical divisors on a given Gorenstein canonical del Pezzo surface. Keywords del Pezzo surfaceeffective anticanonical divisorlog canonical threshold WebMay 6, 2009 · 11 Citations Metrics Abstract We prove that a terminal three-dimensional del Pezzo fibration has no fibers of multiplicity >6. We also obtain a rough classification of possible configurations of singular points on multiple fibers and give some examples. Download to read the full article text References

WebApr 21, 2016 · Cylinders in singular del Pezzo surfaces Part of: Affine geometry Birational geometry Cycles and subschemes Surfaces and higher-dimensional varieties Published …

WebIn this article, we shall look into the existence of vertical cylinders contained in a weak del Pezzo fibration as a generalization of the former work due to Dubouloz and Kishimoto in …

WebFamilies of simple subgroups in the Cremona group arising from del Pezzo fibrations Igor Krylov (KIAS Seoul, Republic of Korea) ... Cylinders in canonical del Pezzo fibrations Masatomo Sawahara (Saitama University, Japan) ... Classification of toric log del Pezzo surfaces with few singular points Yusuke Suyama (Osaka University, Japan) ... list of foods with high fibre contentWebDec 19, 2024 · In this article, we shall look into the existence of vertical cylinders contained in a weak del Pezzo fibration as a generalization of the former work due to Dubouloz … imaginext toy story figuresWebNov 27, 2024 · CYLINDERS IN WEAK DEL PEZZO FIBRATIONS Authors MASATOMO SAWAHARA Content type: OriginalPaper Published: 13 April 2024 Pages: 413 - 437 … imaginext toy story 3 landfillWebDec 18, 2024 · Cylinders in projective varieties play an important role in connection with unipotent group actions on certain affine algebraic varieties. The previous work due to Dubouloz and Kishimoto deals... imaginext toys r us canadahttp://math.bu.edu/people/yslin/Slides/SLAG.pdf imaginext toy story 3 walking rexWebCYLINDERS IN WEAK DEL PEZZO FIBRATIONS MASATOMO SAWAHARA Abstract. In this article, we shall look into the existence of vertical cylinders contained in a weak del Pezzo ﬁbration as a generalization of the former work due to Dubouloz and Kishimoto in which they observed that of vertical cylinders found in del Pezzo ﬁbrations. The … list of foods with high cholesterol contentWebDec 18, 2024 · In this article, we shall look into the existence of vertical cylinders contained in a weak del Pezzo fibration as a generalization of the former work due to Dubouloz … list of foods with low saturated fat