Constructs a singular normal affine complex surface with free rank-two tangent sheaf, disproving the characteristic-zero Lipman–Zariski conjecture.
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In A singular normal affine surface with free tangent sheaf, 23 September 2026
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There exist a finitely generated normal integral \CC-algebra A of Krull dimension two and a maximal ideal \m\subset A such that
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Theorem 1.1
In A singular normal affine surface with free tangent sheaf, 23 September 2026