Sur les ensembles de dimension faible
Stefan Mazurkiewicz (1929)
Fundamenta Mathematicae
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Stefan Mazurkiewicz (1929)
Fundamenta Mathematicae
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Casimir Kuratowski (1932)
Fundamenta Mathematicae
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Casimir Kuratowski (1937)
Fundamenta Mathematicae
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Karol Borsuk (1937)
Fundamenta Mathematicae
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Wacław Sierpiński (1938)
Fundamenta Mathematicae
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Edward Szpilrajn (1937)
Fundamenta Mathematicae
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Nicolas Oeconomidis (1963)
Annales scientifiques de l'École Normale Supérieure
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Paul Urysohn (1925)
Fundamenta Mathematicae
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Cet article est une étude détaillée sur certaines problèmes de topologie. En particulier l'auteur étudie les problèmes suivantes: Problème: (J_n) Donner une définition purement géométrique des multiplicités Jordaniennes n-dimensionnelles. Problème: Indiquer les ensembles les plus généraux qui méritent encore d'être appelés lignes, surfaces etc. Problème: Donner une nouvelle définition des lignes Cantoriennes. Dans le première chapitre l'auteur donne quelques définition fondamentales....
Haïkel Skihri (1999)
Studia Mathematica
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The aim of this paper is to study the α-semi-Fredholm operators in a nonseparable Hilbert space H for all cardinals α with . In the first part, we find the relation between and for all -regular cardinals α, where is the reduced minimum modulus of weight α, c is the reduced minimum modulus (in a C*-algebra) and is the canonical surjection from B(H) onto . We study the continuity points of the maps and . In the second part, we prove some approximation results for semi-Fredholm...