Shafarevich conjecture for varieties with large fundamental group

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Let XX be a smooth complex projective variety. Its fundamental group is large if, for every closed irreducible positive-dimensional subvariety Z⊂XZ\subset X, the image

Im⁡[π1(Znorm)⟶π1(X)]\operatorname{Im}\bigl[\pi_1(Z^{\mathrm{norm}})\longrightarrow\pi_1(X)\bigr]

is infinite. Shafarevich conjecture. If XX has a large fundamental group, then its universal covering X~\widetilde{X} is Stein. This is a partial converse to the fact that Stein universal covers contain no positive-dimensional compact subvarieties. The source states that the conjecture remains open in full generality, although the linear case is known.

References

Primary source

Ya Deng, “Topology, Hyperbolicity, and the Shafarevich Conjecture for Complex Algebraic Varieties”, arXiv:2512.24458 (2025).

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