2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/147709I present an elementary essay on some issues related to nonrelativistic quantum mechanics, which is written in the spirit of extreme simplicity, making it an easy-to-read paper. Moreover, one can find a useful collection of ideas and opinions expressed by many well-known authors in this vast research field15pp, twocolumnGeneral Relativity and Quantum CosmologyQuantum Physicstext