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References

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    By numerically exact we mean a convergent solution computable to any number of significant figures with a realistic amount of computer time. Calculations were done using arbitrary precision arithmetic in Mathematica. We have had no trouble performing calculations with several hundred significant digits in order to resolve a large number of poles in the Green's function.
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    It should be noted for any calculation for regularly spaced imaginary time coordinates, be it quantum Monte Carlo or perturbative Green's function calculations, the natural expansion is a Green's function of the form Eq. 1 that fits all the “Matsubara” data rather than a direct fit of the continuum form 1/( i ωn - εk).
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