Abstract
It is well known that if T = A ⊕ B , where A is compact, then T has a nontrivial hyperinvariant subspace. In this paper, we try to solve the hyperinvariant subspace problem for operators which have a compact part. Our main result is that if A is compact, then either ( A ⁎ 0 B ) or ( A 0 ⁎ B ) has a nontrivial hyperinvariant subspace.
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