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On one class of bases in Hilbert spaces and the similarity problem for volterra operators

✍ Scribed by G. M. Gubreev


Publisher
Springer US
Year
1992
Tongue
English
Weight
242 KB
Volume
26
Category
Article
ISSN
0016-2663

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Abrtract. Sufficient conditions are given such that the product T1T2 of two unbounded operators in Hilbert spaces is essentially selfadjoint and that the nonzero numbers in the essential spectrum of the closure of TlT2 coincide with the nonzero numbers in the essential spectrum of T2T1. If the essen