Modified Onshuus–Pillay conjecture with a small-model-definable subgroup
Modified Onshuus–Pillay conjecture with a small-model-definable subgroup
Let be a highly saturated -minimal structure over a -adic field , let be a definable group, and set . Let be a small model defining . Recall that is the smallest type-definable subgroup of of small index, and that is compactly dominated by when the quotient map satisfies the compact-domination condition with respect to normalized Haar measure. Modified Onshuus–Pillay conjecture. There is an -dimensional -definable open subgroup such that
is isomorphic to an -dimensional Lie group over , and is compactly dominated by . This strengthens the original formulation by requiring the subgroup to be definable over the fixed small model . The source says that the original Onshuus–Pillay conjecture is technically resolved, but that the author does not know how to prove this modified variant; it is therefore open.
Sources & referencesView supporting material
Primary source
Will Johnson, “Generic differentiability and P-minimal groups”, arXiv:2404.17234 (2026).
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