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Un résultat sur les fonctions de classe C 1 , α et application au problème de Cauchy

Robert Dalmasso (1986)

Annales de l'institut Fourier

Nous montrons principalement que, si f 0 est une fonction différentiable sur un intervalle [ 0 , T ] , si sa dérivée est höldérienne d’ordre α avec 0 < α 1 et si f ' ( 0 ) = 0 (resp. f ' ( T ) = 0 ) quand f ( 0 ) = 0 (resp. f ( T ) = 0 ) alors f 1 / ( 1 + α ) , qui est absolument continue, admet (presque partout) une dérivée bornée presque partout.

Uncountable sets of unit vectors that are separated by more than 1

Tomasz Kania, Tomasz Kochanek (2016)

Studia Mathematica

Let X be a Banach space. We study the circumstances under which there exists an uncountable set 𝓐 ⊂ X of unit vectors such that ||x-y|| > 1 for any distinct x,y ∈ 𝓐. We prove that such a set exists if X is quasi-reflexive and non-separable; if X is additionally super-reflexive then one can have ||x-y|| ≥ slant 1 + ε for some ε > 0 that depends only on X. If K is a non-metrisable compact, Hausdorff space, then the unit sphere of X = C(K) also contains such a subset; if moreover K is perfectly...

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