TY - JOUR
AU - Toke Carlsen
AU - Marius Winger
PY - 2018/09/05
Y2 - 2019/05/21
TI - Orbit equivalence of graphs and isomorphism of graph groupoids
JF - MATHEMATICA SCANDINAVICA
JA - MathScand
VL - 123
IS - 2
SE - Articles
DO - 10.7146/math.scand.a-105087
UR - https://www.mscand.dk/article/view/105087
AB - We show that the groupoids of two directed graphs are isomorphic if and only if the two graphs are orbit equivalent by an orbit equivalence that preserves isolated eventually periodic points. We also give a complete description of the (topological) isolated points of the boundary path space of a graph. As a result, we are able to show that the groupoids of two directed graphs with finitely many vertices and no sinks are isomorphic if and only if the two graphs are orbit equivalent, and that the groupoids of the stabilisations of two such graphs are isomorphic if and only if the stabilisations of the graphs are orbit equivalent.
ER -