Tretter, ChristianeWagenhofer, Markus2020-03-092020-03-092007-02-14https://media.suub.uni-bremen.de/handle/elib/2336The block numerical range (BNR) of a block operator matrix is a generalization of the numerical range of an operator acting on a Hilbert space. Main topics of this thesis are block diagonalizability of a block operator matrix if its BNR consists of the maximal number of connected components and spectral properties of corners of BNRs of block operator matrices and block operator functions.eninfo:eu-repo/semantics/openAccessblock operator matrixblock operator functionblock numerical rangequadratic numerical rangenumerical range510Dissertationurn:nbn:de:gbv:46-diss000106161