La propriété de Banach Saks ne passe pas de à , d’après J. Bourgain
La réédition de l'œuvre majeure de Stieltjes
La théorie des séries de Nicole Oresme dans sa perspective aristotélicienne. ‘Questions 1 et 2 sur la Géométrie d’Euclide’
Oresme est connu, entre autres choses, pour avoir développé dans ses Questions sur la Géométrie d’Euclide une « théorie des séries », incluant la nature et la sommation des séries géométriques ainsi que la divergence de la série harmonique. Dans le présent article on se propose de voir en quel sens Oresme a réellement développé une théorie des séries, en situant cette théorie dans le cadre des conceptions mathématiques médiévales. Cette théorie peut être vue comme un approfondissement mathématique...
Laconicity and redundancy of Toeplitz matrices.
Lacunary almost summability in certain linear topological spaces.
Lacunary convergence of series in L0 revisited.
A simpler proof is given for the recent result of I. Labuda and the author that a series in the space L0 (lambda) is subseries convergent if each of its lacunary subseries converges.
Lacunary equi-statistical convergence of positive linear operators
In this paper, the concept of lacunary equi-statistical convergence is introduced and it is shown that lacunary equi-statistical convergence lies between lacunary statistical pointwise and lacunary statistical uniform convergence. Inclusion relations between equi-statistical and lacunary equi-statistical convergence are investigated and it is proved that, under some conditions, lacunary equi-statistical convergence and equi-statistical convergence are equivalent to each other. A Korovkin type approximation...
Lacunary statistical convergence and inclusion properties between lacunary methods.
Lacunary statistical convergence on probabilistic normed spaces.
Lacunary strong -convergence
The definition of lacunary strongly convergence is extended to the definition of lacunary strong -convergence with respect to invariant mean when is an infinite matrix and is a strictly positive sequence. We study some properties and inclusion relations.
Lacunary strong convergence with respect to a sequence of modulus functions
The definition of lacunary strong convergence is extended to a definition of lacunary strong convergence with respect to a sequence of modulus functions in a Banach space. We study some connections between lacunary statistical convergence and lacunary strong convergence with respect to a sequence of modulus functions in a Banach space.
Lacunary weak statistical convergence
The aim of this work is to generalize lacunary statistical convergence to weak lacunary statistical convergence and -convergence to weak -convergence. We start by defining weak lacunary statistically convergent and weak lacunary Cauchy sequence. We find a connection between weak lacunary statistical convergence and weak statistical convergence.
Le prolongement analytique et les séries sommables
Le théorème taubérien de Wiener et l'équation de la chaleur
Leibniz Series forπ
In this article we prove the Leibniz series for π which states that π4=∑n=0∞(−1)n2⋅n+1. The formalization follows K. Knopp [8], [1] and [6]. Leibniz’s Series for Pi is item 26 from the “Formalizing 100 Theorems” list maintained by Freek Wiedijk at http://www.cs.ru.nl/F.Wiedijk/100/.
Les bonnes moyennes uniformisantes et une application à la resommation réelle
Limit points of arithmetic means of sequences in Banach spaces
We shall prove the following statements: Given a sequence in a Banach space enjoying the weak Banach-Saks property, there is a subsequence (or a permutation) of the sequence such that whenever belongs to the closed convex hull of the set of weak limit points of . In case has the Banach-Saks property and is bounded the converse assertion holds too. A characterization of reflexive spaces in terms of limit points and cores of bounded sequences is also given. The motivation for the...
Limit points of eigenvalues of truncated unbounded tridiagonal operators
Let T be a self-adjoint tridiagonal operator in a Hilbert space H with the orthonormal basis {e n}n=1∞, σ(T) be the spectrum of T and Λ(T) be the set of all the limit points of eigenvalues of the truncated operator T N. We give sufficient conditions such that the spectrum of T is discrete and σ(T) = Λ(T) and we connect this problem with an old problem in analysis.
Linear matrix differential equations of higher-order and applications.
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