Re: [eigen] inverse unit test

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I hit the same problem several times and the implementation of
isMuchSmallerThan for float is:

inline bool ei_isMuchSmallerThan(float a, float b, float prec =
  return ei_abs(a) <= ei_abs(b) * prec;

if b is zero, then whatever prec is, it will failed if a is not zero,
so I do agree with Hauke that his implementation is needed.
So in fact in my own code I finally used the function he proposed.

- cheers,


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