Abstract
We present an integrability test for discrete equations on the square lattice, which is based on the existence of a generalized symmetry. We apply this test to a number of equations obtained in different recent papers. As a result we prove the integrability of seven equations which differ essentially from the QV equation introduced by Viallet and thus from the Adler–Bobenko–Suris list of equations contained therein.
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More From: Journal of Physics A: Mathematical and Theoretical
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