Geodesic
Inversion of the $R$~operation and $\xi$~functional
Teoretičeskaâ i matematičeskaâ fizika, Tome 77 (1988) no. 1, pp. 51-59

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An inversion of the $R$ operation is constructed and studied. A formalism of $\xi$ functionals for studying renormalization problems is proposed. 
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     title = {Inversion of the $R$~operation and $\xi$~functional},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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G. B. Pivovarov; F. V. Tkachev. Inversion of the $R$~operation and $\xi$~functional. Teoretičeskaâ i matematičeskaâ fizika, Tome 77 (1988) no. 1, pp. 51-59. http://geodesic.mathdoc.fr/item/TMF_1988_77_1_a4/