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math.FA2023★ 1 cited
On the invariant subspace problem in Hilbert spaces
Per H. Enflo
In this paper we show that every bounded linear operator T on a Hilbert space H has a closed non-trivial invariant subspace.
math.FA2001
A property of strictly singular 1-1 operators
George Androulakis, Per Enflo
We prove that if T is a strictly singular 1-1 operator defined on an infinite dimensional Banach space X, then for every infinite dimensional subspace Y of X there exists an infini…