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math.GR2015
Algorithmic aspects of branched coverings I. Van Kampen's Theorem for bisets
Laurent Bartholdi, Dzmitry Dudko
We develop a general theory of "bisets": sets with two commuting group actions. They naturally encode topological correspondences. Just as van Kampen's theorem decomposes into a gr…
cs.CC2015
Algorithmic aspects of branched coverings
Laurent Bartholdi, Dzmitry Dudko
This is the announcement, and the long summary, of a series of articles on the algorithmic study of Thurston maps. We describe branched coverings of the sphere in terms of group-th…