2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/93871A history of Feynman's sum over histories is presented in brief. A focus is placed on the progress of path-integration techniques for exactly path-integrable problems in quantum mechanics.3 pages, to appear in the proceedings of the 6th International Conference on "Path-Integrals from peV to TeV", Florence, Italy, 1998Quantum PhysicsHigh Energy Physics - TheoryMathematical PhysicsHistory and Philosophy of Physicstext