Natural forms

Xem 1-20 trên 464 kết quả Natural forms
  • .Form and Fabric in Landscape Architecture Form and Fabric in Landscape Architecture provides an original, visual approach to the study of landscape architecture by creating a spatial morphology based on use and experience of landscapes. It explores aesthetic, spatial and experiential concepts by providing a structure through which landscapes can be understood and conceived in design. ‘Fabric’ is the integrated structure of whole landscapes, while ‘form’ refers to the components that make up this fabric.

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  • The paper presents the state of elaboration of the natural language information retrieval system DIALOG. Its aim is an automatic, conversational extraction of facts from a given text. Actually it is real medical text on gastroenterology, which was prepared by a team of specialists. The system has a modular structure. The first, and in fact very important module is the language analysis module. Its task is to ensure the transition of a medical text from its natural form, i.e. rentences formed by physicians, into a formal ~ogical notation. ...

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  • In all languages the forms people use when speaking fomally are differnet from those used informally. In English we tend to use formal speech with stangers and people of higher status, and informal speech with family, friends, and colleagues.

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  • Because American ecocriticism, as a movement, is only about a dozen years old, generalizations about it are hard to make and still harder to validate.1 So I want to begin, not by describing the principles and practices of ecocriticism in any detail (in fact, that is something I want to delay, especially as regards the practices, until chapter four), but by looking at what seems to be, for many of its adherents, ecocriticism’s moment of origin, which is threefold in its implications.

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  • What is the nature of Nature? Is it harmonious and graceful? Is it divine and providential? Is it cruel and wild? These days, answers to the question 'What is the nature of Nature?' often reverberate with claims of natural unity: every living thing in nature, and this includes humanity, is united. The unity of nature idea appears in many different forms; in the speeches of environmentally conscious politicians, in the academic writings of scientists, in the sermons of theological leaders, and in the slogans of social activists.

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  • This book challenges the conventional wisdom that natural resource wealth promotes autocracy. Oil and other forms of mineral wealth can promote both authoritarianism and democracy, the book argues, but they do so through different mechanisms; an understanding of these different mechanisms can help elucidate when either the authoritarian or democratic effects of resource wealth will be relatively strong.

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  • The Ricci flow was introduced by Hamilton in 1982 [H1] in order to prove that a compact three-manifold admitting a Riemannian metric of positive Ricci curvature is a spherical space form. In dimension four Hamilton showed that compact four-manifolds with positive curvature operators are spherical space forms as well [H2]. More generally, the same conclusion holds for compact four-manifolds with 2-positive curvature operators [Che]. Recall that a curvature operator is called 2-positive, if the sum of its two smallest eigenvalues is positive. ...

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  • We prove that the Birkhoff normal form of hamiltonian flows at a nonresonant singular point with given quadratic part is always convergent or generically divergent. The same result is proved for the normalization mapping and any formal first integral. Introduction In this article we study analytic (R or C-analytic) hamiltonian flows xk ˙ yk ˙ ∂H , ∂yk ∂H = − , ∂xk = + where xk , yk ∈ C (resp. R), k = 1, 2, . . . n, and H is an analytic hamiltonian with power series expansion at 0 beginning with quadratic terms (so that 0...

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  • A C 1-generic dichotomy for diffeomorphisms: Weak forms of hyperbolicity or infinitely many sinks or sources By C. Bonatti, L. J. D´ ıaz, and E. R. Pujals* A Ricardo Ma˜e (1948–1995), por todo su trabajo n´ Abstract We show that, for every compact n-dimensional manifold, n ≥ 1, there is a residual subset of Diff1 (M ) of diffeomorphisms for which the homoclinic class of any periodic saddle of f verifies one of the following two possibilities: Either it is contained in the closure of an infinite set of sinks or sources (Newhouse phenomenon), or it presents some weak form of...

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  • Under explicit diophantine conditions on (α, β) ∈ R2 , we prove that the local two-point correlations of the sequence given by the values (m − α)2 + (n−β)2 , with (m, n) ∈ Z2 , are those of a Poisson process. This partly confirms a conjecture of Berry and Tabor [2] on spectral statistics of quantized integrable systems, and also establishes a particular case of the quantitative version of the Oppenheim conjecture for inhomogeneous quadratic forms of signature (2,2). The proof uses theta sums and Ratner’s classification of measures invariant under unipotent flows. ...

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  • An exact sequence for KM /2 ∗ with applications to quadratic forms By D. Orlov,∗ A. Vishik,∗∗ and V. Voevodsky∗∗* Contents 1. Introduction 2. An exact sequence for KM /2 ∗ 3. Reduction to points of degree 2 4. Some applications 4.1. Milnor’s Conjecture on quadratic forms 4.2. The Kahn-Rost-Sujatha Conjecture 4.3. The J-filtration conjecture 1. Introduction Let k be a field of characteristics zero. For a sequence a = (a1 , . . .

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  • We settle an old question about the existence of certain ‘sums-of-squares’ formulas over a field F , related to the composition problem for quadratic forms. A classical theorem says that if such a formula exists over a field of characteristic 0, then certain binomial coefficients must vanish. We prove that this result also holds over fields of characteristic p

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  • By means of the Hardy-Littlewood method, we apply a new mean value theorem for exponential sums to confirm the truth, over the rational numbers, of the Hasse principle for pairs of diagonal cubic forms in thirteen or more variables. 1. Introduction Early work of Lewis [14] and Birch [3], [4], now almost a half-century old, shows that pairs of quite general homogeneous cubic equations possess non-trivial integral solutions whenever the dimension of the corresponding intersection is suitably large (modern refinements have reduced this permissible affine dimension to 826; see [13]). ...

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  • Natural Law, whether grounded in human reason or divine edict, is an unwritten form of law which encourages people to follow virtue and shun vice. The concept dominated Renaissance thought, where its literary equivalent, poetic justice, underpinned much of the period's creative writing. R. S. White's study examines a wide range of Renaissance texts, by More, Spenser, Sidney, Shakespeare and Milton, in the light of these developing ideas of Natural Law.

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  • In this paper, we solve the following extension problem. Problem 1. Suppose we are given a function f : E → R, where E is a given subset of Rn. How can we decide whether f extends to a Cm−1,1 function F on Rn ? Here, m ≥ 1 is given. As usual, Cm−1,1 denotes the space of functions whose (m − 1)rst derivatives are Lipschitz 1. We make no assumption on the set E or the function f. This problem, with Cm in place of Cm−1,1, goes back to Whitney [15], [16], [17]. To answer it, we prove the following sharp form of the Whitney extension theorem....

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  • The Oppenheim conjecture, proved by Margulis [Mar1] (see also [Mar2]), asserts that for a nondegenerate indefinite irrational quadratic form Q in n ≥ 3 variables, the set Q(Zn ) is dense. In [EMM] (where we used the lower bounds established in [DM]) a quantitative version of the conjecture was established. Namely: Let ρ be a continuous positive function on the sphere {v ∈ Rn | v = 1}, and let Ω = {v ∈ Rn | v

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  • Because I have at this present undertaken to write of the of the first Tincture, the Root of Metals and Minerals, and to inform you of the Spiritual Essence, how the Metals and Minerals are at first spiritually conceived and born corporally; it will be necessary first of all to utter, and to acquaint you by a speech, that all things consist of two parts, that is, Natural and Supernatural; what is visible, tangible, and hath form or shape, that is natural; but what is intactible, without form, and spiritual, that is supernatural, and must be apprehended and conceived by Faith; such is the Cr...

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  • This book may be reproduced or transmitted in any form by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of the publisher. For information on getting permission for reprints and excerpts, contact permissions@peachpit.com. Notice of Liability The information in this book is distributed on an “As Is” basis, without warranty.

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  • Ancient traditions, when tested by the severe processes of modern investigation, commonly enough fade away into mere dreams: but it is singular how often the dream turns out to have been a half-waking one, presaging a reality.

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  • Any algorithmic study of written English must sooner or later face the problem of unscrambling English affixes. The role of affixes is crucial in the study of word-breaking practice. In the automatic determination of the parts of speech (a central feature of automatic syntactic analysis), the suppressing action of affixes must be understood in detail. In the determination of English citation forms, complete lists of affixes are necessary. The inflection of English verbs is tied up with the existence of suffixes. ...

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