Download Continued Fractions and Orthogonal Functions by S. Clement Cooper, W.J. Thron PDF

By S. Clement Cooper, W.J. Thron

ISBN-10: 0585320152

ISBN-13: 9780585320151

ISBN-10: 0824790715

ISBN-13: 9780824790714

This reference - the court cases of a examine convention held in Loen, Norway - includes info at the analytic concept of persevered fractions and their software to second difficulties and orthogonal sequences of features. Uniting the study efforts of many overseas specialists, this quantity: treats powerful second difficulties, orthogonal polynomials and Laurent polynomials; analyses sequences of linear fractional differences; offers convergence effects, together with truncation errors bounds; considers discrete distributions and restrict services coming up from indeterminate second difficulties; discusses Szego polynomials and their functions to frequency research; describes the quadrature formulation coming up from q-starlike capabilities; and covers endured fractional representations for capabilities regarding the gamma function.;This source is meant for mathematical and numerical analysts; utilized mathematicians; physicists; chemists; engineers; and upper-level undergraduate and agraduate scholars in those disciplines.

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Additional info for Continued Fractions and Orthogonal Functions

Example text

PRINCIPE VARIATIONNEL D’EKELAND 29 (i) f (v) ≤ f (u) ; (ii) v − u ≤ λ ; (iii) ∀ x ∈ S, x = v, f (v) < f (x) + ε λ x −v . La démonstration en est simple. Considérons f˜ : E → R ∪ {+∞} définie par f˜ := f + i S (d’où f˜(x) = f (x) si x ∈ S, +∞ sinon). Il est clair que minimiser f sur S (exactement ou à ε près) équivaut à minimiser f˜ sur E (exactement ou à ε près), car inf f = inf f˜. i. i. sur E. D’après le théorème principal, il existe v ∈ E tel que : (i) f˜(v) ≤ f˜(u) = f (u), donc f˜(v) < +∞, et v ∈ S, f˜(v) = f (v) ; (ii) v − u ≤ λ (rien ne change ici) ; (iii) f (v) = f˜(v) < f˜(x) + λε x − v pour tout x ∈ E, x = v, soit encore f (v) < f (x) + ε x − v pour tout x ∈ S, x = v.

Dans cette manière de faire – élégante au demeurant – on a perdu une chose : la méthode ou technique des approximations successives, celle qui faisait qu’on approchait le point fixe x de ϕ par la suite définie par : xk+1 := ϕ(xk ). • Lorsque E est de dimension finie, ce qui, reconnaissons-le, n’est pas le contexte habituel des problèmes variationnels, il est possible de démontrer des variantes du théorème d’Ekeland avec des perturbations modelées sur · p , p ≥ 1, et donc éventuellement différentiables (comme c’est le cas pour la norme euclidienne · et p = 2).

Sous une forme d’écriture plus ramassée, S = dS − dSc . Voici quelques propriétés de la fonction S , qu’on pourra démontrer sous forme d’exercices : {x ∈ H | S (x) > 0} = S c , {x ∈ H | S (x) = 0} = Fr S, ˚ (un petit dessin peut aider à la compréhension {x ∈ H | S (x) < 0} = S, de ces propriétés) S c = − S (il n’y a pas d’ambiguïté dans la définition puisque d S c = d S c ) S est 1-Lipschitz sur H S est convexe si et seulement si S est convexe. ∗ Quid de la différentiabilité de d S , de d S2 ? ˚ la question ne se pose pas : d S est nulle dans un voisinage de x, • Si x ∈ S, donc d S est (Fréchet-) différentiable en x et ∇d S (x) = 0.

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