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On a new measure on infinite dimensional unite cube
I. Sh. Jabbarov Ganja State University
Аннотация:
Measure Theory plays an important role in many questions of Mathematics.
The notion of a measure being introduced as a generalization of a notion of the
size of a segment made many of limiting processes be a formal procedure, and
by this reason stood very productive in the questions of Harmonic analysis.
Discovery of Haar measure was a valuable event for the harmonic analysis in
topological groups. It stood clear that many of measures, particularly, the
product of Lebesgue measure in finite dimensional cube
$[0,1]^{n} $ could be
considered as a Haar measure. The product measure has many important properties
concerning projections (see [1,3]). The theorems of Fubini and Tonelly made
it very useful in applications.
In this work we show that the coinsidence of considered measures, observed
in finite dimensional case, impossible for infinite dimensional case, despite that
such a representation was in use without proof. Considering infinite dimensional
unite cube
$\Omega =[0,1]\times [0,1]\times \cdots $, we define in this cube the
Tichonoff metric by a special way despite that it induces the same topology. This
makes possible to introduce a regular measure eliminating difficulties connected with
concentration of a measure, with the progress of a dimension, around the bound. We use
the metric to define a set function in the algebra of open balls defining their
measure as a volume of open balls. By this way we introduce a new measure
in infinite dimensional unite cube different from the Haar and product measures
and discuss some differences between introduced measure and the product
measure.
Main difference between the introduced measure and Haar measure consisted in non
invariance of the first. The difference between the new measure and
product measure connected with the property: let we are given with a infinite
family of open balls every of which does not contain any other with total finite
measure; then they have an empty intersection. Consequently, every point contained
in by a finite number of considered balls only.
This property does not satisfied by cylindrical set. For example, let
$D_{1} =I_{1} \times I\times I\times \cdots $, $D_{2} =I_{2} \times I_{1} \times I\times I\times \cdots,\dots$
$$
I=[0,1], I_{k} =\left[0,\frac{k}{k+1} \right], k=1,2,....
$$
It clear that every of these cylindrical sets does contain any other, but their
intersection is not empty (contains zero). This makes two measures currently
different.
Bibliography: 8 titles.
Ключевые слова:
Measure theory, Lebesgue measure, Haar measure, Borel measure.
УДК:
517 Поступила в редакцию: 13.03.2014
Язык публикации: английский