Campana's almost abelian fundamental group conjecture for special varieties
Campana's almost abelian fundamental group conjecture for special varieties
Let be a special variety. Write for its fundamental group, and define the maximal irregularity by
Here a group is almost abelian if it contains an abelian subgroup of finite index. Campana's fundamental-group conjecture. One has
- is almost abelian;
- if , then is finite.
The conjecture is motivated by the expectation that special varieties are, in a suitable birational sense, successive extensions of orbifolds with Fano or numerically trivial canonical bundle. The source does not specify a resolution of either assertion.
Sources & referencesView supporting material
Primary source
Frédéric Campana and Benoît Claudon, “Quelques propriétés de stabilité des variétés spéciales”, arXiv:1410.2958 (2014).
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