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.

References

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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