PTQMC stochastically reproduces exact MBPT coefficients up to 16th order on the Richardson pairing model and defines e^S as a complexity measure that better indicates when perturbative expansions remain valid.
Padé, Sur la représentation approchée d’une fonction par des fractions rationnelles , Annales scientifiques de l’École Normale Supérieure Série 3, 9, 3 (1892)
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Stochastic many-body perturbation theory for high-order calculations
PTQMC stochastically reproduces exact MBPT coefficients up to 16th order on the Richardson pairing model and defines e^S as a complexity measure that better indicates when perturbative expansions remain valid.