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Diophantine geometry. An introduction. (English) Zbl 0948.11023
Graduate Texts in Mathematics. 201. New York, NY: Springer. xiii, 558 p. DM 79.00/139.00; $ 39.95/69.95 pbk/hbk (2000).

In 1922 Mordell conjectured that every algebraic curve of genus 2 has at most finitely many rational points. This conjecture was proved by Faltings in 1983. In 1991 Vojta gave a completely different proof, based on diophantine approximation. Vojta’s proof was then simplified by Bombieri. In the textbook under review, the authors work towards Bombieri’s proof, giving the reader the necessary background. Unlike several other textbooks in this field, the prerequisites are quite modest, so the book is very useful for instance for a graduate course on diophantine geometry. Each chapter goes along with many exercises. We give a brief overview of the contents of the book.

In part A, the authors, starting from scratch, give the necessary algebraic-geometric background on curves, surfaces, abelian varieties and Jacobians.

Part B is about height functions. The authors discuss heights on algebraic varieties, canonical heights, canonical heights on abelian varieties, local height functions, and canonical local height functions on abelian varieties. Further, a proof of Mumford’s gap principle for rational points on curves of genus 2 is included.

In part C about rational points on abelian varieties, the authors prove the Mordell-Weil theorem stating that for any number field k the group of k-rational points on an abelian variety is finitely generated.

In part D, the basics of diophantine approximation are introduced. The authors give a proof of Roth’s theorem on the approximation of algebraic numbers by rational numbers, and then deduce Siegel’s theorem that algebraic curves of genus 1 have only finitely many S-integral points.

In part E about rational points on curves of genus 2 the authors give a detailed account of Bombieri’s proof of Mordell’s conjecture.

Lastly, in part F, about further results and open problems, the authors give an overview of some of the recent developments (without proofs) and discuss some of the main conjectures. Among other things the authors discuss Faltings’ results on rational points on subvarieties of abelian varieties, the work of Szpiro, Ullmo and Zhang on Bogomolov’s conjecture, effectivity problems, the abc-conjecture, the Bombieri-Lang conjecture, Vojta’s conjecture and related conjectures.


MSC:
11GxxArithmetic algebraic geometry (Diophantine geometry)
14-01Textbooks (algebraic geometry)
11-01Textbooks (number theory)
14GxxArithmetic problems in algebraic geometry. Diophantine geometry
11G10Abelian varieties of dimension >1
11J68Approximation to algebraic numbers
11G30Curves of arbitrary genus or genus 1 over global fields
11G50Heights
14G05Rational points
14G25Global ground fields
14G40Arithmetic varieties and schemes; Arakelov theory; heights
14K15Arithmetic ground fields (abelian varieties)