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Cocyclic Hadamard matrices and difference sets

机译:Cocyclic Hadamard矩阵和差分集

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This paper locates cocyclic Hadamard matrices within the mainstream of combinatorial design theory. We prove that the existence of a cocyclic Hadamard matrix of order 4t is equivalent to the existence of a normal relative difference set with parameters (4t,2,4t,2t). In the basic case we note there is a corresponding equivalence between coboundary Hadamard matrices and Menon-Hadamard difference sets. These equivalences unify and explain results in the theories of Hadamard groups, divisible designs with regular automorphism groups, and periodic autocorrelation functions. (C) 2000 Elsevier Science B.V. All rights reserved. [References: 38]
机译:本文在组合设计理论的主流范围内找到了共循环Hadamard矩阵。我们证明,阶数为4t的同环Hadamard矩阵的存在等同于参数为(4t,2,4t,2t)的正态相对差集的存在。在基本情况下,我们注意到共边界Hadamard矩阵与Menon-Hadamard差集之间存在对应的等价关系。这些等价统一并解释了Hadamard群理论,具有规则自同构群的可分式设计以及周期性自相关函数的结果。 (C)2000 Elsevier Science B.V.保留所有权利。 [参考:38]

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