Ultra LI-ideals in lattice implication algebras
Keyun Qin, Yang Xu, Young Bae Jun · Czechoslovak Mathematical Journal · 2002
We define an ultra LI -ideal of a lattice implication algebra and give equivalent conditions for an LI -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 LI -ideal.