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COMBINATORICS
2004
14 years 9 months ago
2004
A construction supporting a conjecture that different ground state pairs exist in the 2-dimensional Edwards-Anderson Ising spin glass is presented.
COMBINATORICS
2004
14 years 9 months ago
2004
Let (0, 1), l 2 and let Hn be an l-graph on n vertices. Hn is (, )-uniform if every n vertices of Hn span (
COMBINATORICS
2004
14 years 9 months ago
2004
We prove Borchardt's identity det 1 xi - yj per 1 xi - yj = det 1 (xi - yj)2 by means of sign-reversing involutions.
COMBINATORICS
2000
14 years 9 months ago
2000
A construction is given of 2 9(d + 1)2 equiangular lines in Euclidean d-space, when d = 3
COMBINATORICS
2000
14 years 9 months ago
2000
We deal, from a theoretical point of view, with the asymmetric Hamiltonian p