Tensorial square of the hyperoctahedral group coinvariant space.
The 6 vertex model and Schubert polynomials.
The fundamental group of a locally finite graph with ends-a hyperfinite approach
The end compactification |Γ| of a locally finite graph Γis the union of the graph and its ends, endowed with a suitable topology. We show that π₁(|Γ|) embeds into a nonstandard free group with hyperfinitely many generators, i.e. an ultraproduct of finitely generated free groups, and that the embedding we construct factors through an embedding into an inverse limit of free groups. We also show how to recover the standard description of π₁(|Γ|) given by Diestel and Sprüssel (2011). Finally, we give...
The Garnir relations for Weyl groups of type .
The hyperplanes of .
The maximum distinguishing number of a group.
The skeleton of a reduced word and a correspondence of Edelman and Green.
The skew and relative derangements of type B.
The use of Schubert polynomials in SYMCHAR.
Total positivity for cominuscule Grassmannians.