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Does every matrix have periodic orbits of even length?
Thanks! But this matrix is not hyperbolic, and you can't have a hyperbolic matrix satisfying A^k=I.
Prove an inequality on $l^2$ sequences over $F_2$
(sorry, deleted the comment, it wasn't obviously right)
Nonsingularity of Euclidean distance matrix
Thanks for answer, although - what happens if the number of points is greater than $n$? Dimension arguments won't work anymore.