The Schur-Horn theorem for operators with finite spectrum

B. V. Rajarama Bhat, Mohan Ravichandran

The carpenter problem in the context of $I{I}_1$ factors, formulated by Kadison asks: Let $\mathcal{A}\subset \mathcal{M}$ be a masa in a type $I{I}_1$ factor and let $E$ be the norma…