A Periodicity Theorem for the Octahedron Recurrence

Details A Periodicity Theorem for the Octahedron Recurrence A Periodicity Theorem for the Octahedron Recurrence

2006-04-12

arxiv.org/abs/math/0604289v2

Mathematics

Combinatorics

22 pages, (a few pictures added, section 3 has been reorganized)

Scientific paper

We investigate a variant of the octahedron recurrence which lives in a 3-dimensional lattice contained in [0,n] x [0,m] x R. Generalizing results of David Speyer math.CO/0402452, we give an explicit non-recursive formula for the values of this recurrence in terms of perfect matchings. We then use it to prove that the octahedron recurrence is periodic of period n+m. This result is reminiscent of Fomin and Zelevinsky's theorem about the periodicity of Y-systems.

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