Algebraicity characterization for rank-three lift geometries

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Let Γ\Gamma be a nontrivial finite group, and let pp be a prime. Lift-geometry algebraicity conjecture. The matroid LG⁡+(3,Γ)\operatorname{LG}^+(3,\Gamma) is algebraic over GF⁡(p)\operatorname{GF}(p) if and only if there is some integer j≥1j\ge 1 such that Γ≅Zpj\Gamma\cong \mathbb Z_p^j. This would help characterize the fields over which lift geometries are algebraic. It is known that algebraicity over a field of characteristic pp forces every element of Γ\Gamma to have order a power of pp, but whether Γ\Gamma must be Abelian is unclear.

References

Primary source

Jim Geelen, Peter Nelson and Zach Walsh, “Excluding a line from C-representable matroids”, arXiv:2101.12000 (2025).

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