Zeitschrift für Naturforschung AOn the Foundation of Quantal Proposition SystemsWilhelm OchsPublished Jun 1, 1972• 2 citationsPublisherAbstractAbstract We investigate the arguments recently given by Jauch and Piron that quantal proposition systems form a complete atomic lattice. Our analysis shows that the reasoning of these authors can not establish the intended result.DOI10.1515/zna-1972-0603