Finiteness of the topological fundamental group of an irreducible symplectic regular locus

Let XX be an irreducible symplectic variety, and let XregX^{\mathrm{reg}} denote its regular locus. Write π1(Xreg)\pi_1(X^{\mathrm{reg}}) for the topological fundamental group of XregX^{\mathrm{reg}}.

Finiteness conjecture. The group π1(Xreg)\pi_1(X^{\mathrm{reg}}) is finite:

π1(Xreg)<.|\pi_1(X^{\mathrm{reg}})|<\infty.

The algebraic fundamental group of the regular locus is known to be finite, but the corresponding assertion for the topological fundamental group is posed as an open question.

Sources & referencesView supporting material

Primary source

Philip Engel, Stefano Filipazzi, François Greer, Mirko Mauri and Roberto Svaldi, “Boundedness of some fibered K-trivial varieties”, arXiv:2507.00973 (2025).

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