Abstract:
Kuperberg showed that the partition function of the square-ice model related
to quarter-turn-symmetric alternating-sign matrices of even order is
the product of two similar factors. We propose a square-ice model whose states
are in bijection with the quarter-turn-symmetric alternating-sign matrices of
odd order and show that the partition function of this model can be written
similarly. In particular, this allows proving Robbins's conjectures related
to the enumeration of quarter-turn-symmetric alternating-sign matrices.
Citation:
A. V. Razumov, Yu. G. Stroganov, “Enumeration of quarter-turn-symmetric alternating-sign matrices of odd order”, TMF, 149:3 (2006), 395–408; Theoret. and Math. Phys., 149:3 (2006), 1639–1650