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Number Theory III : Diophantine Geometry, PDF eBook

Number Theory III : Diophantine Geometry PDF

Edited by Serge Lang

Part of the Encyclopaedia of Mathematical Sciences series

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In 1988 Shafarevich asked me to write a volume for the Encyclopaedia of Mathematical Sciences on Diophantine Geometry.

I said yes, and here is the volume. By definition, diophantine problems concern the solutions of equations in integers, or rational numbers, or various generalizations, such as finitely generated rings over Z or finitely generated fields over Q.

The word Geometry is tacked on to suggest geometric methods.

This means that the present volume is not elementary.

For a survey of some basic problems with a much more elementary approach, see [La 9Oc].

The field of diophantine geometry is now moving quite rapidly.

Out- standing conjectures ranging from decades back are being proved.

I have tried to give the book some sort of coherence and permanence by em- phasizing structural conjectures as much as results, so that one has a clear picture of the field.

On the whole, I omit proofs, according to the boundary conditions of the encyclopedia.

On some occasions I do give some ideasfor the proofs when these are especially important.

In any case, a lengthy bibliography refers to papers and books where proofs may be found.

I have also followed Shafarevich's suggestion to give examples, and I have especially chosen these examples which show how some classical problems do or do not get solved by contemporary in- sights.

Fermat's last theorem occupies an intermediate position.

Al- though it is not proved, it is not an isolated problem any more.

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