Geodesic
Existence of Green's functions in the Euclidean domain for the $P(\varphi)_2$-theory
Teoretičeskaâ i matematičeskaâ fizika, Tome 18 (1974) no. 2, pp. 174-180 
V. P. Gachok; N. S. Gonchar. Existence of Green's functions in the Euclidean domain for the $P(\varphi)_2$-theory. Teoretičeskaâ i matematičeskaâ fizika, Tome 18 (1974) no. 2, pp. 174-180. http://geodesic.mathdoc.fr/item/TMF_1974_18_2_a2/
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     title = {Existence of {Green's} functions in the {Euclidean} domain for the $P(\varphi)_2$-theory},
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Voir la notice de l'article provenant de la source Math-Net.Ru

It is proved that Green's functions exist in the Euclidean domain for polynomial two-dimensional scalar models of the theory without spatial and time cutoffs. The theory of hypercontractive semigroups is used to prove this result.

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