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

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.

Sources & referencesView supporting material

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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