Publications and Preprints

Ordinally weighted unitarily invariant norms of matrices, or operators, are basically symmetric norms of their singular values weighted by an ordered set of weights. A trimmed version of these norms is obtained by considering only a few of the largest singular values. In this short note polars of these norms are characterized as in Mudholkar and Freimer (1985, Proc. Amer. Math. Soc., {\bf 95} 331-337). A simple expression for the weighted version of the Ky Fan $k-$norm is also obtained.