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Determinant could be faster if use LU #456

@cortner

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@cortner

I noticed the rrule for det does not use the LU factorisation. Is this intentional? Or is it implicit?

EDIT: implicitly both rrule and frule do use the factorisation but it could be reused for effiicency. For rrule a question of numerical stability remains but not clear to me yet if resolvable?

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