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vo-rodrigues/wallace-problem-palomar

Juliane Trianon Fraga, Vinicius de Oliveira Rodrigues

Palomar Registrypalomar/PALOMAR-2026-08-19-000004Aug 19, 2026math.GRscore 0

Lean 4 formalization of the theorem that every torsion-free Abelian group of cardinality continuum admits a Hausdorff countably compact group topology in which every convergent sequence is eventually constant, and constructs a commutative Tychonoff countably compact cancellative topological monoid that is not a group, giving a negative answer to Wallace's question.

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