2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/56400Recent progress on a constructive approach to QFT which is based on modular theory is reviewed and compared with the standard quantization approaches. Talk given at ``Quantum Theory and Symmetries'', Goslar, Germany, July 19998 pages, tcilatexHigh Energy Physics - Theorytext