Borel regular measure

Borel regular measure

In mathematics, an outer measure "μ" on "n"-dimensional Euclidean space R"n" is called Borel regular if the following two conditions hold:

* Every Borel set "B" ⊆ R"n" is "μ"-measurable in the sense of Carathéodory's criterion: for every "A" ⊆ R"n",::mu (A) = mu (A cap B) + mu (A setminus B).
* For every set "A" ⊆ R"n" (which need not be "μ"-measurable) there exists a Borel set "B" ⊆ R"n" such that "A" ⊆ "B" and "μ"("A") = "μ"("B").

An outer measure satisfying only the first of these two requirements is called a "Borel measure", while an outer measure satisfying only the second requirement is called a "regular measure".

The Lebesgue outer measure on R"n" is an example of a Borel regular measure.

References

*cite book
last = Evans
first = Lawrence C.
coauthors = Gariepy, Ronald F.
title = Measure theory and fine properties of functions
publisher = CRC Press
date = 1992
pages =
isbn = 0849371570

*cite book
last = Taylor
first = Angus E.
title = General theory of functions and integration
publisher = Dover Publications
date = 1985
pages =
isbn = 0486649881

*cite book
last = Fonseca
first = Irene
coauthors = Gangbo, Wilfrid
title = Degree theory in analysis and applications
publisher = Oxford University Press
date = 1995
pages =
isbn = 0198511965


Wikimedia Foundation. 2010.

Игры ⚽ Поможем написать курсовую

Look at other dictionaries:

  • Regular measure — In mathematics, a regular measure on a topological space is a measure for which every measurable set is approximately open and approximately closed .DefinitionLet ( X , T ) be a topological space and let Σ be a sigma; algebra on X that contains… …   Wikipedia

  • Inner regular measure — In mathematics, an inner regular measure is one for which the measure of a set can be approximated from within by compact subsets.DefinitionLet ( X , T ) be a Hausdorff topological space and let Sigma; be a sigma; algebra on X that contains the… …   Wikipedia

  • Uniformly distributed measure — In mathematics specifically, in geometric measure theory a uniformly distributed measure on a metric space is one for which the measure of an open ball depends only on its radius and not on its centre. By convention, the measure is also required… …   Wikipedia

  • List of integration and measure theory topics — This is a list of integration and measure theory topics, by Wikipedia page.Intuitive foundations*Length *Area *Volume *Probability *Moving averageRiemann integral*Riemann sum *Riemann Stieltjes integral *Bounded variation *Jordan contentImproper… …   Wikipedia

  • Borel measure — In mathematics, the Borel algebra is the smallest sigma; algebra on the real numbers R containing the intervals, and the Borel measure is the measure on this sigma; algebra which gives to the interval [ a , b ] the measure b − a (where a < b… …   Wikipedia

  • Radon measure — In mathematics (specifically, measure theory), a Radon measure, named after Johann Radon, is a measure on the σ algebra of Borel sets of a Hausdorff topological space X that is locally finite and inner regular. Contents 1 Motivation 2 Definitions …   Wikipedia

  • Haar measure — In mathematical analysis, the Haar measure is a way to assign an invariant volume to subsets of locally compact topological groups and subsequently define an integral for functions on those groups.This measure was introduced by Alfréd Haar, a… …   Wikipedia

  • Trivial measure — In mathematics, specifically in measure theory, the trivial measure on any measurable space ( X , Σ) is the measure μ which assigns zero measure to every measurable set: μ ( A ) = 0 for all A in Σ.Properties of the trivial measureLet μ denote the …   Wikipedia

  • Regularity theorem for Lebesgue measure — In mathematics, the regularity theorem for Lebesgue measure is a result in measure theory that states that Lebesgue measure on the real line is a regular measure. Informally speaking, this means that every Lebesgue measurable subset of the real… …   Wikipedia

  • Dirac measure — In mathematics, a Dirac measure is a measure δx on a set X (with any σ algebra of subsets of X) defined by for a given and any (measurable) set A ⊆ X. The Dirac measure is a probability measure, and in terms of probability it represents …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”