Equivariant smoothing of piecewise linear manifolds
classification
🧮 math.GT
math.GN
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dimensionlinearpiecewiseactsfourgroupadmitschallenge
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We prove that every piecewise linear manifold of dimension up to four on which a finite group acts by piecewise linear homeomorphisms admits a compatible smooth structure with respect to which the group acts smoothly. This solves a challenge posed by Thurston in dimension three and confirms a conjecture by Kwasik and Lee in dimension four in a stronger form.
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