Existence of non-normal EP operators with prescribed range

From papers

Let H\mathcal H be a Hilbert space and let WH\mathcal W\subseteq\mathcal H be a closed subspace. An operator TT on H\mathcal H is EP when its range agrees with the range of its Moore–Penrose inverse, and R(T)\mathcal R(T) denotes its range.

Existence conjecture. There exists a non-normal EP operator TT on H\mathcal H such that

R(T)=W.\mathcal R(T)=\mathcal W.

The statement asserts that every closed subspace of a Hilbert space can occur as the range of a non-normal EP operator. The supplied text does not indicate whether this assertion is known or unresolved.

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Sources & referencesView supporting material

Primary source

P. Sam Johnson, Vinoth A. and K. Kamaraj, “Fuglede-Putnam type commutativity theorems for EP operators”, arXiv:2101.06725 (2021).

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