Mera Rivas, María EugeniaMorán Cabré, Manuel2023-06-202023-06-2020000147-1937https://hdl.handle.net/20.500.14352/60448In 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.engjournal articlehttps://projecteuclid.org/euclid.rae/1230939148open accessDoubling conditionPorosity of StesPorosity of MeasuresTangent measures.Matemáticas (Matemáticas)12 Matemáticas