The sections in this article are
Input–Output System Representation
Nonlinear Differential Algebraic Representation
Volterra Representation
State‐Space Representation
Bilinear Representation
Narma Representation
Fuzzy‐Logic Nonlinear Representation
Nonlinear Representation Using Neural Networks
Model‐Free Representation
Features of Nonlinear Representations
Example
Concluding Remarks
Acknowledgment