2 problems

Let $A_S$ be an Artin group whose Coxeter diagram is a tree. A vertex of the Artin complex $\Delta_S$ is of type $\hat s=S\setminus\{s\}$ if it corresponds to a coset of the form…

Let $A$ be an irreducible Artin group of euclidean type, and let $B A$ be the classifying space constructed in the paper. Let $M$ be the standard topological space with fundamental…