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On the Lebesgue density theorem

Wilczyński W.

Journal of Applied Analysis

2012

Vol. 18, nr 2

275-281

The classical Lebesgue density theorem says that almost each point of a measurable set A is a density point of A. It is well known that the density point of a measurable set A can be described in terms of the convergence in measure of a sequence of characteristic functions of sets similar to A. In this note it is shown that in the Lebesgue density theorem the convergence in measure cannot be replaced by the convergence almost everywhere.