4 problems

Let $M_A$ be a matrix algebra, and let $\varrho_1,\varrho_2\in M_A\otimes M_A$ be states. Let $\varrho_1\square\varrho_2\in M_A\otimes(M_A\otimes M_A)$ denote their block Schur pro…

A projective Banach lattice is a Banach lattice with the projective lifting property, and a topological order unit is an element whose principal order ideal is dense in the lattice…

Characterization and cardinal-invariant conjecture. begin{enumerate} item A compact space $X$ is D-separable if and only if $X$ has a $\sigma$-disjoint $\pi$-base. item For every c…

Let $G$ be a group hyperbolic relative to the peripheral system $\mathcal{P}=\{P_1,\ldots,P_n\}$. Suppose that hyperbolic groups are residually finite, and that each $P_i$ is finit…