On reversible abelian Hadamard differenc
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Qing Xiang
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Article
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1998
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Elsevier Science
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English
โ 97 KB
It is shown that there does not exist a reversible abelian Hadamard di erence set in Z 2 2 ร Z 2 9 or Z 2 4 รZ 2 3 . This settles the last two open cases for the existence of reversible (4N 2 ; 2N 2 -N; N 2 -N )abelian Hadamard di erence sets with N ยก10.