Extension of the Adler-Bobenko-Suris classification of integrable lattice equations
classification
🌊 nlin.SI
keywords
classificationequationslatticeintegrableadler-bobenko-surisadmissibleallowingcases
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The classification of lattice equations that are integrable in the sense of higher-dimensional consistency is extended by allowing directed edges. We find two cases that are not transformable via the 'admissible transformations' to the lattice equations in the existing classification.
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