4 problems

For a root system of Dynkin type, let $\operatorname{Cat}^m$ denote the corresponding extended Catalan arrangement. An arrangement is flag-accurate when it admits a flag satisfying…

Let $W$ be a well-generated reflection group acting on a complex vector space $V$. A frame $\Lambda$ is the auxiliary structure used to define the properties strongly stratified an…

Let $W$ be a well-generated reflection group acting on a complex vector space $V$. A generating set $R$ is well-generating when it generates $W$ and has cardinality $\dim V$. The s…

Residual torsion-free nilpotence conjecture. The fundamental group of the complement