Existence of non-normal EP operators with prescribed range

About 5 years old · traced to

Let H\mathcal H be a Hilbert space and let W⊆H\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.

References

Primary source

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

Progress summary

Never refreshed

Nothing recorded yet. Refresh searches the literature and the public web for attempts on this problem, and writes the first summary here.

Solutions 0

No solutions have been posted yet.