Nijmegen Bombardment on 22 February 1944: A Faux Pas or the Price of Liberation?, Van Esch Joris A. C.

Автор: Joris-Karl Huysmans
Название: Against Nature
ISBN: 0140447636 ISBN-13(EAN): 9780140447637
Издательство: Random House - Penguin
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Описание: Des Esseintes is a decadent, ailing aristocrat who retreats to an isolated villa where her indulges his taste for luxury and excess. Veering between nervous excitability and debilitating ennui, he gluts his aesthetic appetites with classical literature and art, exotic jewels (with which he fatally encrusts the shell of his tortoise).

Автор: Aschenbrenner, Matthias Dries, Lou Van Den, L.p.d. Hoeven, Joris Van Der
Название: Asymptotic differential algebra and model theory of transseries
ISBN: 0691175438 ISBN-13(EAN): 9780691175430
Издательство: Wiley
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Описание:

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 self-contained 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.