On the existence of $E_0$-semigroups -- the multiparameter case

S. P. Murugan, S. Sundar

Let $P\subset {\mathbb{R}}^d$ be a closed convex cone. Assume that $P$ is pointed, i.e. the intersection $P\cap -P=\{0\}$ and $P$ is spanning, i.e. $P-P={\mathbb{R}}^d$. Denote t…