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math.AT2015
Coverings of Profinite Graphs
Amrita Acharyya, Jon M. Corson, Bikash Das
We define a covering of a profinite graph to be a projective limit of a system of covering maps of finite graphs. With this notion of covering, we develop a covering theory for pro…
math.GR2015
Cofinite Graphs and Groupoids and their Profinite Completions
Amrita Acharyya, Jon M. Corson, Bikash Das
We define cofinite graphs and cofinite groupoids in a unified way that extends the notion of cofinite groups introduced by Hartley. The common underlying structure of all these obj…