Invariant subspaces for Banach space operators with an annular spectral set
TRANSACTIONS OF THE AMERICAN MATHEMATICAL SOCIETY, cilt.360, sa.5, ss.2661-2680, 2008 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 360 Sayı: 5
- Basım Tarihi: 2008
- Dergi Adı: TRANSACTIONS OF THE AMERICAN MATHEMATICAL SOCIETY
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Sayfa Sayıları: ss.2661-2680
- Orta Doğu Teknik Üniversitesi Adresli: Hayır
Özet
Consider an annulus Omega = {z epsilon C : r(0) < |z| < 1} for some 0 < r(0) < 1, and let T be a bounded invertible linear operator on a Banach space X whose spectrum contains partial derivative Omega. Assume there exists a constant K > 0 such that parallel to p(T)parallel to <= K sup{vertical bar p(lambda)vertical bar : vertical bar lambda vertical bar <= 1} and parallel to p(r(0)T(-1))parallel to <= K sup{vertical bar p(lambda)vertical bar : vertical bar lambda vertical bar <= 1} for all polynomials p. Then there exists a nontrivial common invariant subspace for T* and T*(-1).