The main result of this paper is a list of integrable generalizations of the classical and relativistic Toda chains. This list includes three new types in addition to the well-known chains. Each of them defines a Bäcklund transformation for an NSE-type system. The classification is carried out with the help of a simple symmetry test.
KeywordsCompatibility Condition Nondegeneracy Condition Toda Chain Toda System Integrable Generalization
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