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Difference-covers that are not k-sum-covers. II

Published online by Cambridge University Press:  24 October 2008

D. M. Connolly
Affiliation:
University of York†
J. H. Williamson
Affiliation:
University of York†

Abstract

We examine the possibility of establishing the existence of a compact subset E of ℝ such that EE contains a non-degenerate interval and the semigroup generated by E has measure zero. We show that the existence of such an E is equivalent to the existence of a sequence of difference-covers that are not k-sum-covers for each k∈ℕ, and, further, is equivalent to the existence of an asymmetric maximal Raikov system.

Type
Research Article
Copyright
Copyright © Cambridge Philosophical Society 1974

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References

REFERENCES

(1)Jackson, T. H., Williamson, J. H. and Woodall, D. R.Difference covers that are not k-sum-covers I. Proc. Cambridge Philos. Soc. 72 (1972), 425438.CrossRefGoogle Scholar
(2)Jackson, T. H.Asymmetric sets of residues. Mathematika 19 (1972), 191199.CrossRefGoogle Scholar
(3)Šreider, Yu A.The structure of maximal ideals in rings of measures with convolutions. Mat. Sbornik 27 (1950), 69. Also Amer. Math. Soc. translations no. 81 (1953).Google Scholar
(4)Williamson, J. H.Raikov systems and the pathology of M(R). Studia Math. 31 (1968), 399409.CrossRefGoogle Scholar
(5)Williamson, J. H.Raikov systems. Symposia on Theoretical Physics and Mathematics 8, ed. Ramakrishman, Alladi (New York, 1968).Google Scholar
(6)Erdös, P.On some properties of Hamel bases. Colloq. Math. 10 (1963), 267269.CrossRefGoogle Scholar
(7)Gelfand, I. M., Raikov, D. A. and Shilov, G. E.Commutative normal rings (New York, 1964).Google Scholar
(8)Connolly, D. M.Integer difference-covers which are not k-sum-covers for k = 6, 7. Proc. Cambridge Philos. Soc. 74 (1973), 1728.CrossRefGoogle Scholar