Subspace gaps and Weyl's theorem for an elementary operator

by B. P. Duggal
Published 2005-01-01

Putnam-Fuglede theorem and the range-kernel orthogonality of derivations

by B. P. Duggal
Published 2001-01-01

Moving Weyl’s Theorem from f (T ) to T

by M. Febronio Rodríguez, B.P. Duggal, S.V. Djordjević
Published 2018-12-01