Geodesic
Algorithmic aspects of branched coverings I/V. Van Kampen’s theorem for bisets
Laurent Bartholdi1 orcid ; Dzmitry Dudko2
1École Normale Supérieure, Paris, France and Universität Göttingen, Germany
2Jacobs-Universität Bremen, Germany
Groups, geometry, and dynamics, Tome 12 (2018) no. 1, pp. 121-172

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DOI

We develop a general theory of bisets: sets with two commuting group actions. They naturally encode topological correspondences.
DOI : 10.4171/ggd/441
Classification : 14-XX, 20-XX, 57-XX
Mots-clés : Bisets, amalgamated free products, graphs of groups, graphs of bisets, coverings, van Kampen’s theorem

Laurent Bartholdi  1   ; Dzmitry Dudko  2

1 École Normale Supérieure, Paris, France and Universität Göttingen, Germany
2 Jacobs-Universität Bremen, Germany 
Laurent Bartholdi; Dzmitry Dudko. Algorithmic aspects of branched coverings I/V. Van Kampen’s theorem for bisets. Groups, geometry, and dynamics, Tome 12 (2018) no. 1, pp. 121-172. doi: 10.4171/ggd/441
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     title = {Algorithmic aspects of branched coverings {I/V.} {Van} {Kampen{\textquoteright}s} theorem for bisets},
     journal = {Groups, geometry, and dynamics},
     pages = {121--172},
     year = {2018},
     volume = {12},
     number = {1},
     doi = {10.4171/ggd/441},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/ggd/441/}
}
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