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UnitConjecture.counterexamples.ii

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If $P$ is the Promislow group, then the group ring $\mathbb{C}[P]$ has a non-trivial unit.

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Lean 4 Statement 
theorem UnitConjecture.counterexamples.ii :
    ∃ (u : (MonoidAlgebra ℂ PromislowGroup)ˣ), ¬IsTrivialUnit u.val
ID: Wikipedia__Kaplansky__UnitConjecture.counterexamples.ii
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