Lectures on curves on rational and unirational surfaces. by Masayoshi Miyanishi

Cover of: Lectures on curves on rational and unirational surfaces. | Masayoshi Miyanishi

Published by Springer-Verlag for the Tata Instituteof Fundamental Research in Berlin .

Written in English

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ContributionsTata Institute of Fundamental Research.
ID Numbers
Open LibraryOL21338990M
ISBN 100387089438

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Curves On Rational And Unirational Surfaces By Masayoshi Miyanishi. Preface These notes were prepared for my lectures at the Tata Institute from Jan-uary, through March, The sections 2, 5 and 6 of Chapter I, the sections 5 and 6 of Chapter II, and the section 3 of Chapter III could.

Posted by keman on in | ∞. Lectures on Curves On Rational And Unirational Surfaces. Lectures on Curves On Rational And Unirational Surfaces. In the second author deliv1lred a series of lectures at haverford col lege on the subject of rational points on cubic curves.

Algebraic curves: affine and projective plane curves, and their local properties. main page. Lectures on Curves on Rational and Unirational Surfaces.PM. Lectures on Curves on Rational and Unirational Surfaces. Lectures on Curves On Rational And Unirational Surfaces. Lectures on Curves, Surfaces and Projective Varieties (Ems Textbooks in Mathematics) by Ettore Carletti (Author), Dionisio Gallarati (Author), and Giacomo Monti Bragadin Mauro C.

Beltrametti (Author) out of 5 stars 1 rating ISBN Reviews: 1. You can write a book review and share your experiences. Other readers will always be interested in your opinion of the books you've read.

Whether you've loved the book or not, if you give your honest and detailed thoughts then people will find new books that are right for them. Theorem 8 [MM83] Every complex projective K3 surface contains at least one rational curve.

Furthermore, suppose (X,h) ∈Kg is very general, i.e., in the complement of a countable union of Zariski-closed proper subsets. Then X con-tains an infinite number of rational curves. Results on density of rational curves over the standard topology have. For curves and surfaces, being rationally connected is equivalent to being rational.

Why is rationality and rational connectivity the same for surfaces. We will see later () that a rationally connected variety has no forms. If X is a surface without forms, it follows from the classi cation of surfaces that Xis rational. A rational curve containing a general point [C] ∈ M g can be represented by a surface fibered over a curve having Camong its fibres.

For this reason we will study such fibrations. Let’s introduce some terminology. By a fibration we mean a surjective morphism f: X→ S with connected fibres and nonsingular general fibre from a.

Thus F is a rational curve, and clearly, F" = ore,whenE is of finite dimension, definition and definition define the same class of projective rational curves. Definition will be preferred, since it leads to a treatment of rational curves in.

and that Y contains no rational curves. Any rational map X99KY is de ned everywhere. Proof. Let X0ˆX Y be the graph of a rational map u: X99KY. The rst projection induces a birational morphism f: X0!X.

Assume its exceptional locus Exc(f) is nonempty. By Propositionthere exists a rational curve on Exc(f) which is contracted by p. Given d in IN, we prove that all smooth K3 surfaces (over any field of characteristic p other than 2,3) of degree greater than 84d^2 contain at most 24 rational curves of degree at most d.

In the exceptional characteristics, the same bounds hold for non-unirational K3 surfaces, and we develop analogous results in the unirational case. For d at least 3, we also construct K3 surfaces of any. unirational K3 surfaces with moving rational curves.) In case there is an involution on the K3 surface, one can control these multiplicities: Theorem 4 ([BHT]) If Xis a K3 surface over C with Pic(X) = ZH;H2 = 2.

Then there exist in nitely many rational curves. To deal with the general case of odd Picard rank, we introduce the fol. Lectures on Curves On Rational And Unirational Surfaces. The aim of these lectures is to study rational points and rational curves on varieties, Then we prove that a smooth cubic hypersurface containing a K-point is unirational over K.

That is, there is a dominant map g: Pn99KX. This of course gives plenty of rational curves on Xas images of rational curves on Pn. Note however, that in general, g. Definition 1. A surface X is unirational if there is a dominant morphism Y → X from a rational surface.

Corollary 1. In characteristic zero, a unirational surface is rational. Note that this is not true in characteristic > 0, e.g. the Zariski surfaces zp = f(x,y).

Proof. Given f: Y →X where Y is rational, we have q(Y) = p 2(Y) = 0. RATIONAL SURFACES Rational Surfaces and Multiprojective Maps In this chapter, rational surfaces are investigated. We begin by exploring the possibility of defining rational surfaces in terms of polar forms.

As in the case of rational curves, polar forms are actually multilinear, and rational surfaces are defined in terms of. We show that projective K3 surfaces with odd Picard rank contain infinitely many rational curves.

Our proof extends the Bogomolov-Hassett-Tschinkel approach, i.e., uses moduli spaces of stable maps and reduction to positive characteristic. In the algebraic case, properness of a rational parametrization can be characterized via the degree of the implicit equation of a unirational curve (Sendra et al.,Theorem ).

That is, a parametrization P (t) of a unirational curve V (f) is proper if and only if deg (P (t)) = max {deg x f, deg y f}. Lectures on Curves on Rational and Unirational Surfaces by Masayoshi Miyanishi - Tata Institute of Fundamental Research From the table of contents: Introduction; Geometry of the affine line (Locally nilpotent derivations, Algebraic pencils of affine lines, Flat fibrations by the affine line); Curves on an affine rational surface; Unirational surfaces; etc.

Preliminary Mathematics The B-Spline Curve The Bézier Curve Rational Curves Interpolation Surfaces Two " diskettes with accompanying paperback book ISBN / Price: $ 25% DISCOUNT COUPON. Present this coupon to Morgan Kaufmann Publishers at Booth # and receive a 25% discount on your copy.

Interactive Curves and Surfaces. In mathematics, a rational variety is an algebraic variety, over a given field K, which is birationally equivalent to a projective space of some dimension over means that its function field is isomorphic to (, ,),the field of all rational functions for some set {, ,} of indeterminates, where d.

M. Miyanishi, Lectures on Curves on Rational and Unirational Surfaces, Tata Institute of Fundamental Research, Bombay, Google Scholar [11]. 1 Examples of rational varieties 7 Rational and unirational varieties 7 Rational curves 9 Quadric hypersurfaces 13 Quadrics over finite fields 15 Cubic hypersurfaces 20 Further examples of rational varieties 29 Numerical criteria for nonrationality 31 2 Cubic surfaces 35 The Segre–Manin theorem for cubic surfaces 36 Linear systems on.

– m-2 cubic polynomial curve segments, Q 3 Q m – m-1 knot points, t 3 t m+1 – segments Q i of the B-spline curve are • defined over a knot interval • defined by 4 of the control points, P i-3 P i – segments Q i of the B-spline curve are blended together into smooth transitions via (the new & improved) blending functions [t i.

We study deformations of rational curves and their singularities in positive characteristic. expanded lecture notes - final version Birational geometry, rational curves, and even when fixing the positive characteristic or numerical invariants. To do so, we construct unirational Horikawa surfaces in abundance.

Christian Liedtke Matthias. Summary This book offers a wide-ranging introduction to algebraic geometry along classical lines. It consists of lectures on topics in classical algebraic geometry, including the basic properties of projective algebraic varieties, linear systems of hypersurfaces, algebraic curves (with special emphasis on rational curves), linear series on algebraic curves, Cremona transformations, rational.

LECTURE 1. DEFINITIONS AND FIRST EXAMPLES In this lecture we introduce the varieties that are rational or close to being rational and discuss some rst easy examples.

Rational and unirational varieties: definitions Let kbe a xed eld. We will be mostly interested in. [13] C. Liedtke, Lectures on Supersingular K3 Surfaces and the Crystalline Torelli Theorem, in K3 Surfaces and Their Mo duli (), –Springer International Publishing.

Rational curves. Determination from a massic polygon -- Ch. Algorithms -- Ch. Local study. Construction of a BR-curve -- Ch. Conics as BR-curves -- Ch. Rational surfaces.

Determination from a massic net -- Ch. Parameter change in the case of a surface -- Ch. Affine and projective transforms of an SBR-surface -- Ch. Moreover, we say that C is a rational curve if C k C ‾ is irreducible and rational.

Definition Let X be a variety over a field k. We say that X is rationally chain connected (resp. rationally connected) if every pair of distinct general points x 1, x 2 on X, including non-closed points, is connected by a tree of rational curves (resp.

The corresp o nding rational map φ takes the F ermat curve of degr ee 43 = / 8 to C. One can easily complemen t φ to a rationa l map from a F ermat s urface to the Horik awa surface asso cia. "The book Rational algebraic curves: a computer algebra approach is a very complete text on rational curves.

The book is really an excellent reference on genus zero curves. It is very useful, mainly due to the computational material presented. It looks to be intended for graduate students, but anyone who wants to know how symbolic algebraic.

The projective geometry of K3 surfaces shows surprising analogies to the theory of linear systems on curves and to a somewhat lesser extent to the theory of line bundles on abelian varieties. This chapter explains the basic aspects of these analogies and in particular.

(a) On the initeness of the rational curves on a given surface of general type: Let X be a minimal surface of general type and C a rational curve on X possibly with many singularities. I have obtained an explicit bound of CKX under the condition that c2(X). This book features recent developments in a rapidly growing area at the interface of higher-dimensional birational geometry and arithmetic geometry.

It focuses on the geometry of spaces of rational curves, with an emphasis on applications to arithmetic questions. Lectures on Curves on Rational and Unirational Surfaces avg rating — 0 ratings — published — 2 editions Want to Read saving. The lecture notes being made available for download in this series have been retypeset and proof read once.

However, it is quite possible that some errors still remain. Please mail any errata you note to publ @ Acknowledgements of corrections will. Grafis Manual - Free ebook download as PDF ), Text ) or view presentation slides online. grafis5/5(1). 作者:看图 出版社:看图 出版时间: 印刷时间: 页数: ,购买Lectures on Curves on Rational and Unirational Surfaces等外文旧书相关商品,欢迎您到孔夫子旧书网.

K. It is known that S contains rational curves—see Mori-Mukai [18], as well as Theorem 7 and Proposition 17 below.

In fact, an extension of the argument in [18] shows that the general K3 surface of given degree has infinitely many rational curves (see Theorem 9 and [7]).

The idea is to specialize the K3 surface S to a K3 surface S0 with.curves of large rank over C(u) by starting with a general curve over C(t) and iteratively making rational field extensions. What can be done with special elliptic curves remains a very interesting open question about which wespeculateinthelastsection.

Now we connect the theorem with the title of .From Dynamics on Surfaces to Rational Points on Curves The Harvard community has made this article openly available. Please share how this access benefits you. Your story matters Citation McMullen, Curtis T.

From dynamics on surfaces to rational points on curves. Bulletin of the American Mathematical Society – Revised

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