Spectral shorted operators

Jorge Antezana, Gustavo Corach, Demetrio Stojanoff

If $\mathcal{H}$ is a Hilbert space, $\mathcal{S}\subseteq \mathcal{H}$ is a closed subspace of $\mathcal{H}$, and $A$ is a positive bounded linear operator on $\mathcal{H}$, the spec…