2 problems

Converse characterization conjecture. The set $\{\lvert\lambda\rvert: \lambda \mathds{T} \subset \sigma_{usf}(T)\}$ is at most countable and its only accumulation point, if any, is…

Let $X$ be a Banach lattice with Stonean compact $K$, let $Y$ be the subspace and $T$ the weighted composition operator from Proposition 1, and let $S$ be the corresponding weighte…