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The Bethe-Salpeter equation arising from a φ³ theory is solved numerically for several energies (bound states only) and symmetry states. The method used is a variational calculation in the four-dimensional Euclidean space arrived at by the transformation due to Wick. A high degree of accuracy is achieved by using only a very small amount of common computing machine capabilities.
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Charles Schwartz (1965) studied this question.
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