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Analytic properties of npoint loops in perturbation theory

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Il Nuovo Cimento (1955-1965)

Summary

It is shown that simple perturbation graphs consisting of closedn- vertex loops have only the singularities possessed by reduced loops, obtained by ≪ fusing ≫ two or more of the vertices and omitting the internal lines which join them. The theorem holds providingn ⩾ 6.

Riassunto

Si dimostra che i grafici di perturbazione semplioi formati da anse chiuse conn vertici hanno solo le singolarità proprie delle anse ridotte ottemite ≪ fondendo ≫ due o più vertici e omettendo le linee interne che li uniscono. II teorema è valido purohèn⩾ 6.

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Authors and Affiliations

  1. Northwestern University, Evanston, Ill

    L. M. Brown

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  1. L. M. Brown
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Supported in part by a grant from the National Science Foundation.

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Brown, L.M. Analytic properties of npoint loops in perturbation theory. Nuovo Cim 22, 178–182 (1961). https://doi.org/10.1007/BF02829004

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  • DOI: https://doi.org/10.1007/BF02829004

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