Abstract
IfA i i=1, 2 are quasi-similarp-hyponormal operators such thatUi is unitary in the polar decompositionA i =U i |A i |, then σ(A 1)=σ(A 2) andσ c(A1) = σe(A2). Also a Putnam-Fuglede type commutativity theorem holds for p-hyponomral operators.
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