2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/94040A general method for testing essential nonlocality of nonlinear modifications of quantum mechanics is presented and applied to show the inconsistency of I. Bialynicki-Birula's and J. Mycielski's nonlinear quantum theory.10 pages, LaTeX2e file, 1 figure in PicTeX, misprints correctedQuantum Physicstext