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arxiv:2610.11189
Classical cylindrical contact homology is not invariant over bZ
Published on Oct 8
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Abstract
We show that classical cylindrical contact homology over Z, equipped with its decomposition by free homotopy classes, is not invariant under changes of hypertight contact form. Specifically, we construct two nondegenerate hypertight perturbations of the standard Seifert contact form on Σ(2,4,5) whose cylindrical contact homologies in the regular-fiber class are respectively torsion-free and contain Z/5-torsion.
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