The invariant subspaces of S ⊕ S*

Dan Timotin
2020 Concrete Operators  
AbstractUsing the tools of Sz.-Nagy–Foias theory of contractions, we describe in detail the invariant subspaces of the operator S ⊕ S*, where S is the unilateral shift on a Hilbert space. This answers a question of Câmara and Ross.
doi:10.1515/conop-2020-0101 fatcat:bl6cmsvlgjd77m22yqdwvmtkqa