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  • 1 Institute of Mathematics, Dalian University of Technology Dalian 116024, P.R. China
  • 2 Institute of Mathematics, Dalian University of Technology Dalian 116024, P.R. China
  • 3 Department of Computer Science and Technology Center for Combinatorics, Nankai University Tianjin, 300071, P.R. China
  • 4 Institut für Mathematik Institut für Mathematik, Karl-Franzensuniversität Heinrichstrasse 36, 8010 Graz, Austria
  • 5 Institut für Mathematik, Karl-Franzensuniversität Heinrichstrasse 36, 8010 Graz, Austria
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Summary For a finite abelian group G, we investigate the invariant  s(G) (resp.  the invariant  s0(G)) which is defined as the smallest integer l ? N such that every sequence S in G of length |S| = l has a subsequence T with sum zero and length |T|= exp(G) (resp. length |T|=0 mod exp(G)).

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