Christiane Tretter

6 ta ish

University of Bern

1. Spectral Theory of Block Operator Matrices and Applications

   Christiane Tretter

   Kitob200832 iqtibos

   ABIABI:AkademIndex/2026.other.187648

2. Spectral inclusion for unbounded diagonally dominant $n\times n$ operator matrices

   Tulkin H. Rasulov, Christiane Tretter

   Maqola20186 iqtibos

   ABIABI:AkademIndex/2026.other.459941

3. A Krein Space Approach to PT-symmetry

   Heinz Langer, Christiane Tretter

   Maqola20044 iqtibos

   ABIABI:AkademIndex/2026.other.204973

4. A new concept for block operator matrices:the quadratic numerical range

   Heinz Langer, A. Markus, V. Matsaev +1

   Maqola20013 iqtibos

   ABIABI:AkademIndex/2026.other.459937

5. The Block Numerical Range of an <i>n</i> × <i>n</i> Block Operator Matrix

   Christiane Tretter, Markus Wagenhofer

   Maqola20033 iqtibos

   ABIABI:AkademIndex/2026.other.459939

6. SPECTRAL DECOMPOSITION OF SOME NONSELFADJOINT BLOCK OPERATOR MATRICES

   Heinz Langer, Christiane Tretter

   Maqola20072 iqtibos

   ABIABI:AkademIndex/2026.other.712329