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Asymptotic Differential Algebra and Model Theory of Transseries

Online ISBN:
9781400885411
Print ISBN:
9780691175423
Publisher:
Princeton University Press
Book

Asymptotic Differential Algebra and Model Theory of Transseries

Matthias Aschenbrenner,
Matthias Aschenbrenner
University of California, Los Angeles
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Lou van den Dries,
Lou van den Dries
University of Illinois
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Joris van der Hoeven
Joris van der Hoeven
Ecole Polytechnique
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Published online:
19 October 2017
Published in print:
6 June 2017
Online ISBN:
9781400885411
Print ISBN:
9780691175423
Publisher:
Princeton University Press

Abstract

Asymptotic differential algebra seeks to understand the solutions of differential equations and their asymptotics from an algebraic point of view. The differential field of transseries plays a central role in the subject. Besides powers of the variable, these series may contain exponential and logarithmic terms. Over the last thirty years, transseries emerged variously as super-exact asymptotic expansions of return maps of analytic vector fields, in connection with Tarski's problem on the field of reals with exponentiation, and in mathematical physics. Their formal nature also makes them suitable for machine computations in computer algebra systems. This book validates the intuition that the differential field of transseries is a universal domain for asymptotic differential algebra. It does so by establishing in the realm of transseries a complete elimination theory for systems of algebraic differential equations with asymptotic side conditions. Beginning with background chapters on valuations and differential algebra, the book goes on to develop the basic theory of valued differential fields, including a notion of differential-henselianity. Next, H-fields are singled out among ordered valued differential fields to provide an algebraic setting for the common properties of Hardy fields and the differential field of transseries. The study of their extensions culminates in an analogue of the algebraic closure of a field: the Newton–Liouville closure of an H-field. This paves the way to a quantifier elimination with interesting consequences.

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