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math.CO2006
Minimum Mean Cycle Problem in Bidirected and Skew-Symmetric Graphs
Maxim A. Babenko, Alexander V. Karzanov
The problem of finding, in an edge-weighted bidirected graph , a cycle with minimum mean weight of its edges generalizes similar problems for both directed and undirected…
math.RT2006
Combinatorics of -crystals
V. I. Danilov, A. V. Karzanov, G. A. Koshevoy
We show that a connected regular -crystal (the crystal graph of an irreducible representation of ) can be produced from two half-grids by replicating them and glying tog…