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Results tagged with co.combinatorics
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user 16739
Enumerative combinatorics, graph theory, order theory, posets, matroids, designs and other discrete structures. It also includes algebraic, analytic and probabilistic combinatorics.
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what is the largest real orthogonal design in $n$ variables?
A real orthogonal design in $n$ variables is an $m \times n$ matrix with
entries from the set $\pm x_1,\pm x_2,\cdots,\pm x_n$ that satisfies :
$$ A A^T = (x_1^2 + x_2^2 + \cdots x_n^2) I_m $$
Normal …
- 451