2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/56154The principle of invariance of the c-number symmetric bracket is used to derive both the quantum operator commutator relation $[\hat q, \hat p]=i\hbar$ and the time-dependent Schrödinger equation. A c-number dynamical equation is found which leads to the second quantized field theory of bosons and fermions.14 pages. Contributed Paper: XIX International Symposium on Lepton and Photon Interactions at High Energies, Stanford University, August 9-14, 1999High Energy Physics - TheoryThe principle of symmetric bracket invariance as the origin of first and second quantizationtext