Simple rules for expressing an arbitrary Feynman-like diagram in the harmonic oscillator formalism are given. They assure the full factorization and the duality relation in an obvious way. This is achieved by investigation of gauge properties ot the three-resonance vertex. The correspondence of the present model with that of Kikkawa, Sakita and Virasoro is clarified by giving conventions which allow us to omit all the dots attached to the resonance lines. The problem of divergences is not discussed in this work. *> This projection operator is different from Thorn's. 6 > We understand from reference 12), however, that the same one as Eq. (212) has been introduced by Kaku and Thorn.
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Idà et al. (1970) studied this question.