The Ratios Between The Spectral Norm, The Numerical Radius And The Spectral Radius
Kui Du · Zenodo (CERN European Organization for Nuclear Research) · 2010
Recently, Uhlig [Numer. Algorithms, 52(3):335-353, 2009] proposed open questions about the ratios between the spectral norm, the numerical radius and the spectral radius of a square matrix. In this note, we provide some observations to answer these questions.