Search results for "Lebesgue"
showing 10 items of 53 documents
On density and π-weight of Lp(βN,R, μ)
2012
In Integration Theory, it is important to establish the separability or not of Lebesgue spaces of the type Lp, with 1 ≤ p < +∞. In general, the usual proof of this type of results for certain Lebesgue spaces, is conducted through methods of Real Analysis. In this work, we use some concepts and methods of pure General Topology in proving the non-separability of a particular Lebesgue space. Further, we provide some estimates for density and π-weight of such a space.
Assouad dimension, Nagata dimension, and uniformly close metric tangents
2013
We study the Assouad dimension and the Nagata dimension of metric spaces. As a general result, we prove that the Nagata dimension of a metric space is always bounded from above by the Assouad dimension. Most of the paper is devoted to the study of when these metric dimensions of a metric space are locally given by the dimensions of its metric tangents. Having uniformly close tangents is not sufficient. What is needed in addition is either that the tangents have dimension with uniform constants independent from the point and the tangent, or that the tangents are unique. We will apply our results to equiregular subRiemannian manifolds and show that locally their Nagata dimension equals the to…
A generalized first-return integration process
2020
We extend the first-return integration process, introduced in [5] by U.B. Darji and M.J. Evans, and prove that each Lebesgue-improper integrable function f : [a, b] --> R is first-return integrable in this generalized sense to (Li)int_a^b f(t) dt.
A Lebesgue-type decomposition on one side for sesquilinear forms
2021
Sesquilinear forms which are not necessarily positive may have a dierent behavior, with respect to a positive form, on each side. For this reason a Lebesgue-type decomposition on one side is provided for generic forms satisfying a boundedness condition.
Some Remarks on Exponential Families
1987
Abstract The following facts may serve to provide a feeling about how restrictive the assumption of an exponential family is. (a) A one-parameter exponential family in standard form with respect to Lebesgue measure is a location parameter family iff it is normal with fixed variance. (b) It is a scale parameter family iff it is gamma with fixed shape parameter. Both facts are known (see Borges and Pfanzagl 1965; Ferguson 1962; Lindley 1958) but may not have received as much attention as they deserve. Under the assumption of differentiable densities, short and elementary proofs are given.
Riemann-Type Definition of the Improper Integrals
2004
Riemann-type definitions of the Riemann improper integral and of the Lebesgue improper integral are obtained from McShane's definition of the Lebesgue integral by imposing a Kurzweil-Henstock's condition on McShane's partitions.
On Variational Measures Related to Some Bases
2000
Abstract We extend, to a certain class of differentiation bases, some results on the variational measure and the δ-variation obtained earlier for the full interval basis. In particular the theorem stating that the variational measure generated by an interval function is σ-finite whenever it is absolutely continuous with respect to the Lebesgue measure is extended to any Busemann–Feller basis.
Lebesguen integraali - Rieszin määritelmä
2016
Tutkielmassa tarkastellaan ensin Riemannin integraalia ja sen ongelmia rajankäyntitilanteissa. Suurin ongelma rajankäynnissä on, että Riemannintegraalien jonon raja-arvo ei välttämättä aina ole sama kuin rajafunktion Riemann-integraali. Lisäksi todetaan, että Riemann-integroituvien funktioiden joukko on melko pieni. Seuraavana esitellään porrasfunktioiden integraali ominaisuuksineen. Tämän jälkeen perehdytään Riemann-integroituvien funktioiden luokkaa suurempaan yläfunktioiden luokkaan L+ ja lisäksi osoitetaan, että Riemann-integroituvat funktiot kuuluvat yläfunktioiden luokkaan. Yläfunktioiden luokan esittelyn jälkeen määritellään Lebesguen integraali ja perehdytään sen ominaisuuksiin. Leb…
Milloin joukon Lebesguen ja Hausdorffin mitat ovat yhtä suuria?
2012
Tässä kirjoitelmassa tarkastelemme Lebesguen ja Hausdorffin mittojen suhdetta tai milloin ne ovat yhtä suuria. Tähän tarkasteluun tarvitsemme muun muassa n-ulotteisen pallon tilavuutta, Vitalin peitelausetta, tasaisesti jakautuneiden ja Borel-säännöllisten mittojen tarkastelua ja Steinerin symmetrisointia. Myös osoitamme, että Borelin joukot ovat Lebesgue- ja Hausdorff-mitallisia.
On the Porosity of Free Boundaries in Degenerate Variational Inequalities
2000
Abstract In this note we consider a certain degenerate variational problem with constraint identically zero. The exact growth of the solution near the free boundary is established. A consequence of this is that the free boundary is porous and therefore its Hausdorff dimension is less than N and hence it is of Lebesgue measure zero.