Nonlinear systems as linear time-varying systems?

Is it possible to represent nonlinear systems as linear time-varying systems? I found little papers and no books covering this subject.
Does anyone have some references on that?
I'm interested in both methods for approximating nonlinear models as LTV models and identification of LTV systems from empirical data.

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I don't think you can.
How can you represent the nonlinear system
\dot{x} = -x^3
as a linear time varying system?
any linear system you pick will not truly represent this non linear system.
If you are trying to approximate the function then linearize the nonlinear system.

Maybe but would that be useful? You'd just be pushing off the non-linearity to the parameters.

as far as i recall you can approximate them by having a finite set of linear time varying systems which approximate the real system around certain points.

like you have a tensor or something of linear time varying systems that are used to do that.

>How can you represent the nonlinear system
>\dot{x} = -x^3
>as a linear time varying system?

well as the solution of the ODE has to be continous you can approximate it pointwise by linear functions.

That is what I said at the bottom, you can just linearize the system.

Yes and it is really useful if you think about it for a while.

Show an article or subject related to this.

Nah, it would just be rejected if I as much as tried. I'm gonna sit here and drink piwo instead.