The locally conical reflection arrangement conjecture

Let WW be a well-generated reflection group acting on a complex vector space VV. A generating set RR is well-generating when it generates WW and has cardinality dimV\dim V. The system (W,R)(W,R) is called abstractly locally conical if, for every U,TRU,T\subseteq R with UU nonempty, every Quillen fiber of

Supp:Face(ΔTU)ΠTU{1^}\mathrm{Supp}:\mathrm{Face}(\Delta^U_T)\to \Pi^U_T\setminus\{\hat{1}\}

has a cone point. The locally conical reflection arrangement conjecture. For each well-generated reflection group WW, there exists a well-generating RR for which (W,R)(W,R) is abstractly locally conical. This property would provide the local conical structure needed to compare the relevant simplicial complexes with the intersection lattice of the reflection arrangement; whether every well-generated reflection group admits such a generating set is left open.

Sources & referencesView supporting material

Primary source

Alexander Miller, “Reflection arrangements and ribbon representations”, arXiv:1108.1429 (2011).

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