Abstract
We consider two infinite classes of ordinary difference equations admitting Lax pair representation. Discrete equations in these classes are parameterized by two integers and We describe the first integrals for these two classes in terms of special discrete polynomials. We show an equivalence between two difference equations belonging to different classes corresponding to the same pair (k, s). We show that solution spaces of different ordinary difference equations with a fixed value of s + k are organized in a chain of inclusions.
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More From: Journal of Physics A: Mathematical and Theoretical
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