Surfaces Meeting Porous Sets in Positive Measure

Details Surfaces Meeting Porous Sets in Positive Measure Surfaces Meeting Porous Sets in Positive Measure

2012-01-11

arxiv.org/abs/1201.2376v1

Mathematics

Functional Analysis

Scientific paper

Let n>2 and X be a Banach space of dimension strictly greater than n. We show there exists a directionally porous set P in X for which the set of C^1 surfaces of dimension n meeting P in positive measure is not meager. If X is separable this leads to a decomposition of X into a countable union of directionally porous sets and a set which is null on residually many C^1 surfaces of dimension n. This is of interest in the study of certain classes of null sets used to investigate differentiability of Lipschitz functions on Banach spaces.

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