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The invariant subspaces of S ⊕ S*
2020
Concrete Operators
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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