2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/55309The unitary transformation of path-integral differential measure is described. The main properties of perturbation theory in the phase space of action-angle, energy-time variables are investigated. The measure in cylindrical coordinates is derived also. The dependence of perturbation theory contributions from global (topological) properties of corresponding phase spaces is shown.17 p., LaTex, no figursHigh Energy Physics - Theorytext