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| arXiv:0704.0640 |
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Title: Skew-Hadamard matrices of orders 188 and 388 exist
Authors: Dragomir Z. Djokovic
Categories: math.CO Combinatorics
Comments: 7 pages, no figures, a paragraph added to the introduction, two misprints corrected. To appear in the International Mathematical Forum
MSC: 05B20; 05B30
Abstract: We construct several difference families on cyclic groups of orders 47 and
97, and use them to construct skew-Hadamard matrices of orders 188 and 388.
Such difference families and matrices are constructed here for the first time.
The matrices are constructed by using the Goethals-Seidel array.
Owner: Dragomir Z. Djokovic
Version 1: Wed, 4 Apr 2007 19:09:27 GMT
Version 2: Wed, 26 Mar 2008 04:51:57 GMT
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