Abstract
In a discrete-time framework any nonlinear system can be approximated with arbitrarily small error by a Volterra series and also by a “sandwich” system.
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Palm, G. On representation and approximation of nonlinear systems. Biol. Cybernetics 34, 49–52 (1979). https://doi.org/10.1007/BF00336857
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DOI: https://doi.org/10.1007/BF00336857