Asymmetric integrable quad-graph equations

Details Asymmetric integrable quad-graph equations Asymmetric integrable quad-graph equations

2009-06-12

arxiv.org/abs/0906.2339v3

Nonlinear Sciences

Exactly Solvable and Integrable Systems

12 pages v1: original version; v2: one equation's conservation laws are simplified; v3: a further minor simplification

Scientific paper

Integrable difference equations commonly have more low-order conservation laws than occur for nonintegrable difference equations of similar complexity. We use this empirical observation to sift a large class of difference equations, in order to find candidates for integrability. It turns out that all such candidates have an equivalent affine form. These are tested by calculating their algebraic entropy. In this way, we have found several types of integrable equations, one of which seems to be entirely unrelated to any known discrete integrable system. We also list all single-tile conservation laws for the integrable equations in the above class.

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