Pagan portals - the hedge druid`s craft, Hoeven, Joanna Van Der

Автор: Van Der Hoeven, Joanna
Название: Pagan portals
ISBN: 1785355732 ISBN-13(EAN): 9781785355738
Издательство: Неизвестно
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Цена: 11430.00 T
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Описание: A guide to the ritual tools and practices of the Druid tradition.

Автор: Van der Hoeven Joanna
Название: Pagan Portals Zen Druidry
ISBN: 1780993900 ISBN-13(EAN): 9781780993904
Издательство: Неизвестно
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Цена: 11430.00 T
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Описание: Zen teachings and Druidry combine to create a peaceful life path that is completely dedicated to the here and now.

Автор: van der Hoeven Joanna
Название: Zen for Druids
ISBN: 1785354426 ISBN-13(EAN): 9781785354427
Издательство: Неизвестно
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Цена: 9490.00 T
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Описание: Where Zen Buddhism and Druidry meet, to create a holistic way of life.

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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Цена: 79200.00 T
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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.