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Remarques sur certains sous-espaces de B M O ( n ) et de b m o ( n )

Gérard Bourdaud — 2002

Annales de l’institut Fourier

On décrit de diverses façons les fermetures respectives, dans l’espace B M O ( n ) et dans sa version locale b m o ( n ) , de l’ensemble des fonctions à support compact et de l’ensemble des fonctions C à support compact. Certains de ces résultats sont nouveaux; d’autres, considérés comme classiques, ne semblent pas avoir fait l’objet de publication. Des contre-exemples permettent de vérifier la diversité des sous-espaces considérés.

Superposition operators and functions of bounded p-variation.

Gérard BourdaudMassimo Lanza de CristoforisWinfried Sickel — 2006

Revista Matemática Iberoamericana

We characterize the set of all functions f of R to itself such that the associated superposition operator T: g → f º g maps the class BV (R) into itself. Here BV (R), 1 ≤ p < ∞, denotes the set of primitives of functions of bounded p-variation, endowed with a suitable norm. It turns out that such an operator is always bounded and sublinear. Also, consequences for the boundedness of superposition operators defined on Besov spaces B are discussed....

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