69 citations · 85 across the 3 of their papers we have counts for
4 papers · 1 filter
Real and complex operator norms
Olga Holtz, Michael Karow
Real and complex norms of a linear operator acting on a normed complexified space are considered. Bounds on the ratio of these norms are given. The real and complex norms are shown…
On indecomposable normal matrices in spaces with indefinite scalar product
Olga Holtz
Finite dimensional linear spaces (both complex and real) with indefinite scalar product [.,.] are considered. Upper and lower bounds are given for the size of an indecomposable mat…
On classification of normal operators in real spaces with indefinite scalar product
Olga Holtz, Vladimir Strauss
A real finite-dimensional space with indefinite scalar product having v- negative squares and v+ positive ones is considered. The paper presents a classification of operators that…
Classification of normal operators in spaces with indefinite scalar product of rank 2
Olga Holtz, Vladimir Strauss
A finite-dimensional complex space with indefinite scalar product [.,.] having v- = 2 negative squares and v+ >= 2 positive ones is considered. The paper presents a classification…