Quasisimilarity Does Not Preserve the Hyperlattice

Domingo A. Herrero
1977 Proceedings of the American Mathematical Society  
Two quasisimilar nilpotent Hubert space operators of order three can have nonisomorphic hyperinvariant subspace lattices.
doi:10.2307/2041995 fatcat:cbfsf4jwufctbekgd7akwlf4ou