Spectrum of an upper triangular infinite matrix Is there any theory about spectra of triangular infinite marices? If so, where could I read something about it?
Any results about the spectra of triangular infinite matrices will be part of the spectral theory of linear operators. You can find it in any respectable functional analysis book. I found a book by Kreyszieg very approachable as I learned and my go-to reference is Methods of Modern Mathematical Physics by Reed and Simon.
Any results about the spectra of triangular infinite matrices will be part of the spectral theory of linear operators. You can find it in any respectable functional analysis book. I found a book by Kreyszieg very approachable as I learned and my go-to reference is Methods of Modern Mathematical Physics by Reed and Simon.