Two conditions for subnormality of unbounded operators
Keyword(s):
The Real
◽
We give two new sufficient conditions for unbounded Hilbert space operators to be subnormal. The first assumes that the sequence //Tnf//2 on a suitable subset of the domain is completely monotonic, the second is similar to the one given by Lambert in [3] for bounded operators and involves the sequence of binomial expansion of the real part of the operator.
1992 ◽
Vol 04
(spec01)
◽
pp. 15-47
◽
2006 ◽
Vol 09
(02)
◽
pp. 305-314
◽
2007 ◽
Vol 44
(2)
◽
pp. 275-290
Keyword(s):
2009 ◽
Vol 61
(2)
◽
pp. 179-187
◽
2017 ◽
Vol 29
(04)
◽
pp. 1750012
◽
1998 ◽
Vol 01
(04)
◽
pp. 561-572
◽
1992 ◽
Vol 111
(1)
◽
pp. 151-160
◽
Keyword(s):
1984 ◽
Vol 95
(1)
◽
pp. 93-100
◽