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  1. Instantons are finite action solutions of the Euclidean equations of motion, arising typically when one computes the vacuum-to-vacuum transition amplitude associated with tunneling through an intermediate potential barrier. Being nonperturbative ab…
  2. For a system of N indistinguishable fermions or bosons, we give a parametrization of the surface of a convex set of N-representable second-order density matrices, a polynomial equation for the exact energy levels, and an explanation of quantum phase…
  3. By a series of simple examples, we illustrate how the lack of mathematical concern can readily lead to surprising mathematical contradictions in wave mechanics. The basic mathematical notions allowing for a precise formulation of the theory are then…

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