Kollár's almost abelianity conjecture for projective manifolds with Kodaira dimension zero

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Let XX be an nn-dimensional projective manifold. The notation κ(X)\kappa(X) denotes its Kodaira dimension, and a group is almost Abelian if it contains an Abelian subgroup of finite index.

Kollár's conjecture. If

κ(X)=0,\kappa(X)=0,

then

π1(X)\pi_1(X)

is almost Abelian.

Kollár's conjecture is known in complex dimensions three and four, but is largely open in higher dimensions. In the source it is presented as a consequence of the preceding conjecture assuming the existence of good minimal models.

References

Primary source

Xin Fu, Bin Guo, Jian Song and Juanyong Wang, “Fundamental groups of compact Kahler varieties with nef anti canonical bundle”, arXiv:2602.07420 (2026).

Additional references

9 papers in this index state this conjecture (2005–2026). The statement above is taken from the most recent of them; the others are arXiv:1407.7478, arXiv:1208.4340, arXiv:1208.4343, arXiv:1102.1240, arXiv:1006.2486, arXiv:0801.1396, arXiv:math/0701105, arXiv:math/0510137.

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