1 research outputs found
The Propus Construction for Symmetric Hadamard Matrices
\textit{Propus} (which means twins) is a construction method for orthogonal
matrices based on a variation of the Williamson array called the
\textit{propus array}
This construction designed to find symmetric Hadamard matrices was originally
based on circulant symmetric matrices, called \textit{propus matrices}.
We also give another construction based on symmetric Williamson-type matrices.
We give constructions to find symmetric propus-Hadamard matrices for 57
orders , odd.
We give variations of the above array to allow for more general matrices than
symmetric Williamson propus matrices. One such is the \textit{ Generalized
Propus Array (GP)}.Comment: 13 pages, 19 figure