“I learned, practically in my cradle (actually from Bill McMillan's thesis), that the ground state wave function of a system of bosons should necessarily be real and positive, a fact which made his early Monte Carlo simulations infinitely easier.”

—  Philip Warren Anderson

[Four Last Conjectures, 23 March 2018, arXiv.org, https://arxiv.org/abs/1804.11186] (section on "Overlap Currents")

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Philip Warren Anderson 13
American physicist 1923

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