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Can I use non linear inequality constraints on either parameters or algebraic variables m?

April 26, 2017algebraic inequality linear parameters variables

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Can I use non linear inequality constraints on either parameters or algebraic variables m?

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No, you can’t. Non linear inequality constraints are indeed very unusual in physical models. Additionally, they would make convergence difficult. Furthermore, remember: algebraic variables and parameters of error-in-variables models can be constrained only using simple bounds.