2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/117088The certainty principle (2005) allowed to conceptualize from the more fundamental grounds both the Heisenberg uncertainty principle (1927) and the Mandelshtam-Tamm relation (1945). In this review I give detailed explanation and discussion of the certainty principle, oriented to all physicists, both theorists and experimenters.One paper, in Russian and in English, no figuresQuantum Physicstext