Fuglede–Putnam conjecture for unbounded operators

At least 8 years old · documented by

Let HH be a complex Hilbert space. Let AA be an operator on HH, densely defined and closed if necessary, and let B∈B(H)B\in B(H) be normal. Fuglede–Putnam conjecture. The inclusion

BA⊂AB∗BA\subset AB^*

should imply

B∗A⊂AB.B^*A\subset AB.

This extends the Fuglede–Putnam theorem from bounded AA to the stated unbounded-operator setting. The claim is known when A∈B(H)A\in B(H), but the source states that it is not covered by known unbounded generalizations.

References

Primary source

Mohammed Meziane and Mohammed Hichem Mortad, “Maximality of Linear Operators”, arXiv:1711.00521 (2017).

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.