Equality of the three-dimensional abelian Cremona group classes
Let and be the classes of finite abelian groups arising in the paper, and let
while
where , , , and . The inclusions and hold. Three-dimensional class conjecture. One has
The conjecture would classify the relevant finite abelian groups in dimension three by showing that no groups beyond the explicitly listed candidates occur. The supplied context does not state whether these equalities have been proved or disproved.
References
Primary source
Luka Filin, “On abelian extensions of finite abelian subgroups of Cremona groups”, arXiv:2510.13200 (2025).
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