Invariant subspaces for positive operators acting on a Banach space with Markushevich basis

Ercan Z., Onal S.

POSITIVITY, cilt.8, sa.2, ss.123-126, 2004 (SCI İndekslerine Giren Dergi) identifier identifier


We introduce 'weak quasinilpotence' for operators. Then, by substituting 'Markushevich basis' and 'weak quasinilpotence at a nonzero vector' for 'Schauder basis' and 'quasinilpotence at a nonzero vector', respectively, we answer a question on the invariant subspaces of positive operators in [ 3].