%0 Journal Article
%A Mera Rivas, María Eugenia
%A Morán Cabré, Manuel
%T Attainable values for upper porosities of measures
%D 2000
%@ 0147-1937
%U https://hdl.handle.net/20.500.14352/60448
%X In this paper we introduce two definitions of upper porosity of a measure which range from 0 to (1/2) and from 0 to 1 respectively, and prove that actually the first porosity only can take the extreme values 0 or (1/2), and the second one takes either the value 0 or the values (1/2) or 1. The other main result of this paper  says that any measure μ which does not satisfy the doubling condition μ-a.e. has a maximal porosity.
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