2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/90911In this note we establish a relation between two exactly-solvable problems on circle, namely singular Coulomb and singular oscillator systems.6 pages, submitted in the Proceedings of the Workshop on "Superintegrability in Classical an Quantum Systems" (September 16-22, 2002, Montreal)Quantum PhysicsHigh Energy Physics - TheoryMathematical Physicstext