Embedding theorems for actions on generalized trees, I
Şerban A. Basarab · arXiv (Cornell University) · 2010
Using suitable deformations of simplicial trees and the duality theory for median sets, we show that every free action on a median set can be extended to a free and transitive one. We also prove that the category of median groups is a reflective full subcategory of the category of free actions on pointed median sets.