Abstract
In a recent paper [J. Math. Phys. 8, 423 (1967)], Dyson and Lenard gave a lower bound of the N‐particle Hamiltonian, Coulomb interaction, which was quadratic in N. An essential step in their proof is the fact that the one‐particle Hamiltonian with Yukawa potential −r−1e−μr is nonnegative if μ is not less than some value. The aim of this paper is to improve this positivity result and thereby improve the lower bound of Dyson and Lenard.
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