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math.CO2018
Two-ended quasi-transitive graphs
Babak Miraftab, Tim Rühmann
The well-known characterization of two-ended groups says that every two-ended group can be split over finite subgroups which means it is isomorphic to either by a free product with…
math.CO2018
A Stallings' type theorem for quasi-transitive graphs
Matthias Hamann, Florian Lehner, Babak Miraftab +1
We consider infinite connected quasi-transitive locally finite graphs and show that every such graph with more than one end is a tree amalgamation of two other such graphs. This ca…