2 papers
math.CO2019
Hopf monoids, permutohedral cones, and generalized retarded functions
William Norledge, Adrian Ocneanu
The commutative Hopf monoid of set compositions is a fundamental Hopf monoid internal to vector species, having undecorated bosonic Fock space the combinatorial Hopf algebra of qua…
math.GR2016
Maximal torsion-free subgroups of certain lattices of hyperbolic buildings and Davis complexes
William Norledge, Anne Thomas, Alina Vdovina
We give an explicit construction of a maximal torsion-free finite-index subgroup of a certain type of Coxeter group. The subgroup is constructed as the fundamental group of a finit…