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On the Sum of Two Borel Sets
P. Erdös and A. H. Stone
Proceedings of the American Mathematical Society
Vol. 25, No. 2 (Jun., 1970), pp. 304-306
Published by: American Mathematical Society
Stable URL: http://www.jstor.org/stable/2037209
Page Count: 3
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It is shown that the linear sum of two Borel subsets of the real line need not be Borel, even if one of them is compact and the other is Gδ. This result is extended to a fairly wide class of connected topological groups.
Proceedings of the American Mathematical Society © 1970 American Mathematical Society