
Our main result is an estimate for a sharp maximal function, which implies a Keith-Zhong type self-improvement property of Poincar�� inequalities related to differentiable structures on metric measure spaces. As an application, we give structure independent representation for Sobolev norms and universality results for Sobolev spaces.
42B25, 35A23, 46E35, 31E05, 30L99, harmoninen analyysi, Mathematics - Analysis of PDEs, inequalities, Mathematics - Classical Analysis and ODEs, harmonic analysis, Classical Analysis and ODEs (math.CA), FOS: Mathematics, Matematiikka, funktionaalianalyysi, epäyhtälöt, Mathematics, Analysis of PDEs (math.AP)
42B25, 35A23, 46E35, 31E05, 30L99, harmoninen analyysi, Mathematics - Analysis of PDEs, inequalities, Mathematics - Classical Analysis and ODEs, harmonic analysis, Classical Analysis and ODEs (math.CA), FOS: Mathematics, Matematiikka, funktionaalianalyysi, epäyhtälöt, Mathematics, Analysis of PDEs (math.AP)
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