2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/194888In this paper we show that there is a Lipatov bound for the radius of convergence for superficially divergent one-particle irreducible Green functions in a renormalizable quantum field theory if there is such a bound for the superficially convergent ones. The radius of convergence turns out to be ${\rm min}\{ρ,1/b_1\}$, where $ρ$ is the bound on the convergent ones, the instanton radius, and $b_1$ the first coefficient of the $β$-function.21 pagesHigh Energy Physics - Theorytext