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math.FA2010★ 1 cited
C-orbit reflexive operators
Don Hadwin, Ileana Ionascu, Michael McHugh +1
We introduce the notion of C-orbit reflexivity and study its properties. An operator on a finite-dimensional space is C-orbit reflexive if and only if the two largest blocks in its…
math.FA2010
Stable and Norm-stable Invariant Subspaces
Alexander Borichev, Don Hadwin, Hassan Yousefi
We prove that if T is an operator on an infinite-dimensional Hilbert space whose spectrum and essential spectrum are both connected and whose Fredholm index is only 0 or 1, then th…