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Questions on symmetric Hadamard matrices

Currently, this is an open problem. So I only got a partial answer. We just need to consider the following two different situations: Case 1: $n$ is not a perfect square. There is no solution if $\...
user369335's user avatar
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Under row operations and column permutations a matrix A can be put in the non-unique form ( I | X ), what is known about the set of possible X?

Let $A$ be an $n \times m$ matrix over $k$. Since the group $\textrm{GL}_{n}(k)$ acts transitively on the ordered bases of an $n$-dimensional $k$-vector space, any $n$ linearly independent columns of $...
Padraig Ó Catháin's user avatar

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