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All-sum sets in (0,1]—Category and measure

Part of: Classical measure theory

Published online by Cambridge University Press:  26 February 2010

Vitaly Bergelson ,
Neil Hindman  and
Benjamin Weiss
Vitaly Bergelson
Affiliation:
Department of Mathematics, Ohio State University, Columbus, OH 43210, U.S.A.
Neil Hindman
Affiliation:
Department of Mathematics, Howard University, Washington, DC 20059, U.S.A.
Benjamin Weiss
Affiliation:
Institute of Mathematics, Hebrew University, Jerusalem, Israel.
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Abstract

We provide a unified and simplified proof that for any partition of (0, 1] into sets that are measurable or have the property of Baire, one cell will contain an infinite sequence together with all of its sums (finite or infinite) without repetition. In fact any set which is large around 0 in the sense of measure or category will contain such a sequence. We show that sets with 0 as a density point have very rich structure. Call a sequence and its resulting all-sums set structured provided for each We show further that structured all-sums sets with positive measure are not partition regular even if one allows shifted all-sums sets. That is, we produce a two cell measurable partition of (0, 1 ] such that neither set contains a translate of any structured all-sums set with positive measure.

MSC classification

Secondary: 28A75: Length, area, volume, other geometric measure theory
Type
Research Article
Information
Mathematika , Volume 44 , Issue 1 , June 1997 , pp. 61 - 87
Copyright
Copyright © University College London 1997

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