2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/55555Large-N field systems are considered from an unusual point of view. The Hamiltonian is presented in a third-quantized form analogously to the second-quantized formulation of the quantum theory of many particles. The semiclassical approximation is applied to the third-quantized Hamiltonian. The advantages of this approach in comparison with 1/N-expansion are discussed.5 pages, LaTeX, no figures, talk presented at the International Conference "Problems of Quantum Field Theory - 98", Dubna, Russia, July 13-17, 1998High Energy Physics - Theorytext