Geodesic
Minimal $R$ operation in the $1/N$ expansion of $\sigma$ models
Teoretičeskaâ i matematičeskaâ fizika, Tome 67 (1986) no. 1, pp. 52-67 Cet article a éte moissonné depuis la source Math-Net.Ru

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The renormalization structure of the $1/N$ expansion in $\sigma$ models is investigated. It is shown that the theory is renormalized by an $R$ operation in which subtractions are made only for some of the subgraphs with non-negative degree (of divergence). In contrast to the standard renormalization, such a renormalization manifestly preserves the nonlinear symmetry of the $\sigma$ model. 
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     title = {Minimal $R$~operation in the $1/N$~expansion of $\sigma$~models},
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V. K. Krivoshchekov; P. B. Medvedev. Minimal $R$ operation in the $1/N$ expansion of $\sigma$ models. Teoretičeskaâ i matematičeskaâ fizika, Tome 67 (1986) no. 1, pp. 52-67. http://geodesic.mathdoc.fr/item/TMF_1986_67_1_a5/

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