We enumerate central configurations with axial symmetry in the 5-body problem with equal masses in three-dimensional space. It is thus shown, that only two of these configurations, have a unique… Expand

Abstract We construct new symmetric Hadamard matrices of orders 92, 116, and 172. While the existence of those of order 92 was known since 1978, the orders 116 and 172 are new. Our construction is… Expand

We design heuristic algorithms to construct Hadamard matrices with two circulant cores of order 116 using the supplementary difference sets formalism.Expand