Abstract and Applied Analysis
Volume 6 (2001), Issue 1, Pages 1-11
doi:10.1155/S1085337501000458

Douglas algebras without maximal subalgebra and without minimal superalgebra

Abstract

We give several examples of Douglas algebras that do not have any maximal subalgebra. We find a condition on these algebras that guarantees that some do not have any minimal superalgebra. We also show that if A is the only maximal subalgebra of a Douglas algebra B, then the algebra A does not have any maximal subalgebra.