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*       GAUSS ERROR INTEGRAL       *
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With method least squares a lot of approximation / optimization problems can be solved.

GAUSS basic thought is very easy and can be understood by everyone.
Supporting not only approximation of functions, but numerical operators too.

Expansion to complex Functions / Operators is easy to do.
For example Operator / Filter design with Fourier Transformation, is only a special
case of Gauss method.

So try to understand   this powerful easy tool