Über den Untergruppenverband der symmetrischen Gruppe, den Unterhalbgruppenver-band der symmetrischen Halbgruppe und den Unter-algebrenverband der Postchen Algebra.
Ueber die von drei Moduln erzeugte Dualgruppe
Ultra -ideals in lattice implication algebras
We define an ultra -ideal of a lattice implication algebra and give equivalent conditions for an -ideal to be ultra. We show that every subset of a lattice implication algebra which has the finite additive property can be extended to an ultra -ideal.
Ultra -Ideals in lattice implication algebras and -algebras
A mistake concerning the ultra -ideal of a lattice implication algebra is pointed out, and some new sufficient and necessary conditions for an -ideal to be an ultra -ideal are given. Moreover, the notion of an -ideal is extended to -algebras, the notions of a (prime, ultra, obstinate, Boolean) -ideal and an -ideal of an -algebra are introduced, some important examples are given, and the following notions are proved to be equivalent in -algebra: (1) prime proper -ideal and Boolean -ideal,...
Uncertainty relations and state spaces
Une Généralisation Du Théorème De Löwenheim Sur Les Équations De Boole
Une généralisation du théorème de Löwenheim sur les équations de Boole.
Une généralisation du théorème d'omission des types dans les algèbres polyadiques
Uniqueness of bounded observables
Using maximal ideals in the classification of MV-algebras
Utilisation des matrices booléennes pour l'étude des treillis de post