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math.CO2019
Patterns in sets of positive density in trees and affine buildings
M. Björklund, A. Fish, J. Parkinson
We prove an analogue for homogeneous trees and certain affine buildings of a result of Bourgain on pinned distances in sets of positive density in Euclidean spaces. Furthermore, we…
math.CO2006
A proof of Bjorner's totally nonnegative conjecture
Michael Bjorklund, Alexander Engstrom
The McMullen Correspondence gives a linear dependence between M-sequences of length |d/2|+1 and f-vectors of simplical d-polytopes. Denote the transfer matrix between g and f by M_…