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Racines de fonctions différentiables

Pierre Lengyel (1975)

Annales de l'institut Fourier

Nous précisons la classe de différentiabilité de f α f désigne une fonction positive de classe C p , p -plate sur l’ensemble de ses zéros, et α un réel, 0 < α < 1  ; de plus, nous étudions l’existence locale d’une racine p -ième de classe C , pour une fonction de classe C admettant une racine p -ième formelle en chaque point.

Ramsey, Lebesgue, and Marczewski sets and the Baire property

Patrick Reardon (1996)

Fundamenta Mathematicae

We investigate the completely Ramsey, Lebesgue, and Marczewski σ-algebras and their relations to the Baire property in the Ellentuck and density topologies. Two theorems concerning the Marczewski σ-algebra (s) are presented.  THEOREM. In the density topology D, (s) coincides with the σ-algebra of Lebesgue measurable sets.  THEOREM. In the Ellentuck topology on [ ω ] ω , ( s ) 0 is a proper subset of the hereditary ideal associated with (s).  We construct an example in the Ellentuck topology of a set which is...

Ranks for baire multifunctions

Pandelis Dodos (2003)

Colloquium Mathematicae

Various ordinal ranks for Baire-1 real-valued functions, which have been used in the literature, are adapted to provide ranks for Baire-1 multifunctions. A new rank is also introduced which, roughly speaking, gives an estimate of how far a Baire-1 multifunction is from being upper semicontinuous.

Refinement of the Jensen integral inequality

Silvestru Sever Dragomir, Muhammad Adil Khan, Addisalem Abathun (2016)

Open Mathematics

In this paper we give a refinement of Jensen’s integral inequality and its generalization for linear functionals. We also present some applications in Information Theory.

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