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Continuity of the spectrum on closed similarity orbits

✍ Scribed by Hari Bercovici; Ciprian Foias; Allen Tannenbaum


Publisher
SP Birkhäuser Verlag Basel
Year
1994
Tongue
English
Weight
92 KB
Volume
18
Category
Article
ISSN
0378-620X

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On the Spectrum of the Product of Closed
✍ Volker Hardt; Alexei Konstantinov; Reinhard Mennicken 📂 Article 📅 2000 🏛 John Wiley and Sons 🌐 English ⚖ 169 KB 👁 2 views

In this note we study the connection between the spectra of the products AB and BA of unbounded closed operators A and B acting in Banach spaces. Under the condition that the resolvent sets of these products are not empty we show that the spectra of AB and BA coincide away from zero and prove the co