Existence of non-normal EP operators with prescribed range
Let be a Hilbert space and let be a closed subspace. An operator on is EP when its range agrees with the range of its Moore–Penrose inverse, and denotes its range.
Existence conjecture. There exists a non-normal EP operator on such that
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.
References
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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