2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/211970The connection between wave functions in the Dirac and Foldy-Wouthuysen representations is found. When the Foldy-Wouthuysen transformation is exact, upper spinors in two representations differ only by constant factors, and lower spinors in the Foldy-Wouthuysen representation are equal to zero.7 pagesMathematical PhysicsHigh Energy Physics - Theory81Q05text