Abstract
We prove that the Cayley graph and the coset geometry of the von Dyck group D(a, b, c) are linked by a vertex-to-edge duality.
The first author was supported by the project P201/12/G028 of the Czech Republic Grant Agency (GA ČR).
The second author was supported by the doctoral school of the University of Salerno.
acknowledgement
The authors would like to thank P. Longobardi and C. Sica for their helpful suggestions, and also the referees for carefully reading the manuscript.
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© 2016 Mathematical Institute Slovak Academy of Sciences
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