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We establish that there are 7 equivalence classes for matrices of order 21 and that there are at least 9884 equivalence classes for matrices of order 26.
This construction uses weighing matrices of order n and weight k together with permutation matrices of order n to obtain D-optimal edge designs.
Let A and B be two real symmetric matrices of order n.
Let (mathbb{C}^{ntimes n}) denote the set of all complex matrices of order n.
Cocyclic construction has been successfully used for Hadamard matrices of order n.
Table 2 shows the value of the RI from matrices of order 1 to 10.
Then there exist two matrices of order and of order such that (2.20).
The algorithms for matrices of order 3, 4, 5, 6 or 7 are efficient.
But for matrices of order, it cannot guarantee to produce an answer.
The number of inequivalent Hadamard matrices of order 40 is at least 3.66×1011.
The algorithms for matrices of order are not guaranteed to produce an answer.
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