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I started to look at different linearization techniques like:

-linear interpolation

- spline interpolation

- curve fitting....

Now Iam wondering (and I guess its very stupid) : As polynomials with a degree > 1 are not linear, why can I use them for linearization?

With the method of piecewise linear interpolation its clear. You connect two datapoints with a linear function.

But what about quadratic and cubic splines which are not linear?

Thanks in advance for any help,

Kind regards,

Mike