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29 March 2024
 
  » arxiv » 1007.2555

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Classification of generalized Hadamard matrices H(6,3) and quaternary Hermitian self-dual codes of length 18
Masaaki Harada ; Clement Lam ; Akihiro Munemasa ; Vladimir D. Tonchev ;
Date 15 Jul 2010
AbstractAll generalized Hadamard matrices of order 18 over a group of order 3, H(6,3), are enumerated in two different ways: once, as class regular symmetric (6,3)-nets, or symmetric transversal designs on 54 points and 54 blocks with a group of order 3 acting semi-regularly on points and blocks, and secondly, as collections of full weight vectors in quaternary Hermitian self-dual codes of length 18. The second enumeration is based on the classification of Hermitian self-dual [18,9] codes over GF(4), completed in this paper. It is shown that up to monomial equivalence, there are 85 generalized Hadamard matrices H(6,3), and 245 inequivalent Hermitian self-dual codes of length 18 over GF(4).
Source arXiv, 1007.2555
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