Abstract:
Estimates for vertex factors of the Feynman graphs in the Ising model are obtained.
These estimates demonstrate the existence of some simple divergent subsequences
of diagrams.
Citation:
N. M. Bogolyubov, “Convergence of Feynman diagram expansions in the Ising model”, TMF, 30:1 (1977), 138–141; Theoret. and Math. Phys., 30:1 (1977), 88–90