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McShane equi-integrability and Vitali’s convergence theorem

Jaroslav Kurzweil, Štefan Schwabik (2004)

Mathematica Bohemica

The McShane integral of functions f I defined on an m -dimensional interval I is considered in the paper. This integral is known to be equivalent to the Lebesgue integral for which the Vitali convergence theorem holds. For McShane integrable sequences of functions a convergence theorem based on the concept of equi-integrability is proved and it is shown that this theorem is equivalent to the Vitali convergence theorem.

Means and generalized means.

Toader, Gheorghe, Toader, Silvia (2007)

JIPAM. Journal of Inequalities in Pure & Applied Mathematics [electronic only]

Mean-value theorem for vector-valued functions

Janusz Matkowski (2012)

Mathematica Bohemica

For a differentiable function 𝐟 : I k , where I is a real interval and k , a counterpart of the Lagrange mean-value theorem is presented. Necessary and sufficient conditions for the existence of a mean M : I 2 I such that 𝐟 ( x ) - 𝐟 ( y ) = ( x - y ) 𝐟 ' ( M ( x , y ) ) , x , y I , are given. Similar considerations for a theorem accompanying the Lagrange mean-value theorem are presented.

Measure-preserving quality within mappings.

Stephen Semmes (2000)

Revista Matemática Iberoamericana

In [6], Guy David introduced some methods for finding controlled behavior in Lipschitz mappings with substantial images (in terms of measure). Under suitable conditions, David produces subsets on which the given mapping is bilipschitz, with uniform bounds for the bilipschitz constant and the size of the subset. This has applications for boundedness of singular integral operators and uniform rectifiability of sets, as in [6], [7], [11], [13]. Some special cases of David's results, concerning projections...

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