Skew-Hadamard matrices of orders 436, 580 and 988 exist
Combinatorics
2009-03-18 v1
Abstract
We construct two difference families on each of the cyclic groups of order 109, 145 and 247, and use them to construct skew-Hadamard matrices of orders 436, 580 and 988. Such difference families and matrices are constructed here for the first time. The matrices are constructed by using the Goethals-Seidel array.
Keywords
Cite
@article{arxiv.0706.1973,
title = {Skew-Hadamard matrices of orders 436, 580 and 988 exist},
author = {Dragomir Z. Djokovic},
journal= {arXiv preprint arXiv:0706.1973},
year = {2009}
}
Comments
12 pages, no figures