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Finite-projection stabilization of contractible affine hypersurfaces

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Abstract

Let X be a smooth contractible affine hypersurface of complex dimension n >= 2 with the holomorphic density property. We prove that X times C^n is biholomorphic to C^(2n). A finite monic projection replaces the proper-embedding parameter in Huang’s stabilization construction, retaining colliding fibers as curvilinear finite schemes. Stratified Oka interpolation and parametric Andersén-Lempert approximation yield compact capture in a fixed Runge Euclidean basin. Applications include McLean’s varieties and the Koras-Russell cubic. The sufficient ambient dimensions in specified nonlinearizable-action constructions are lowered by one, including disconnected cyclic fixed loci in C^6 and a fixed contractible non-Euclidean surface in C^8.

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  1. Edition 4 · 2026-11-02 · public
  2. Edition 3 · 2026-10-27 · public
  3. Edition 2 · 2026-10-24 · public
  4. Edition 1 · 2026-10-24 · public

Research details

Subjects
Mathematics · Complex Analysis · Geometry
Keywords
holomorphic cancellation, density property, Oka principle, affine hypersurfaces, finite schemes
Manuscript date
2026-10-23
Reader reuse
No additional permission granted

Scope

Let X be a smooth contractible affine hypersurface of complex dimension n >= 2 with the holomorphic density property. We prove that X times C^n is biholomorphic to C^(2n). A finite monic projection replaces the proper-embedding parameter in Huang’s stabilization construction, retaining colliding fibers as curvilinear finite schemes. Stratified Oka interpolation and parametric Andersén-Lempert approximation yield compact capture in a fixed Runge Euclidean basin. Applications include McLean’s varieties and the Koras-Russell cubic. The sufficient ambient dimensions in specified nonlinearizable-action constructions are lowered by one, including disconnected cyclic fixed loci in C^6 and a fixed contractible non-Euclidean surface in C^8.

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AI-assisted tools supported research exploration, literature review, manuscript preparation and internal verification. The author retains responsibility for the work.

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References and related resources

  1. L. Boc Thaler, Fatou components , doctoral dissertation, University of Ljubljana, 2016, Theorem IV.15, pp. 62–64. https://repozitorij.uni-lj.si/Dokument.php?id=106392&lang=slv.
  2. F. Forstnerič, The Oka principle for sections of stratified fiber bundles, Pure Appl. Math. Q. 6 (2010), no. 3, 843–874. arXiv:0705.0591v5.
  3. F. Forstnerič, Oka manifolds: From Oka to Stein and back, Ann. Fac. Sci. Toulouse Math. (6) 22 (2013), no. 4, 747–809. arXiv:1211.6383v5.
  4. S. Gorai, A new class of smooth algebraic varieties with the density property and a counterexample to the Tóth–Varolin conjecture , preprint, 2026. arXiv:2610.27660v1.
  5. G. Huang, A counterexample to the holomorphic cancellation problem , preprint, 2026. arXiv:2610.12581v2.
  6. F. Kutzschebauch and A. Ramos-Peon, An Oka principle for a parametric infinite transitivity property, J. Geom. Anal. 27 (2017), no. 3, 2018–2043. arXiv:1401.0093v4.
  7. M. Leuenberger, (Volume) density property of a family of complex manifolds including the Koras–Russell cubic threefold, Proc. Amer. Math. Soc. 144 (2016), 3887–3902. arXiv:1507.03842.
  8. L. Makar-Limanov, On the hypersurface x + x2y + z2 + t3 = 0 in C4 or a C3-like threefold which is not C3, Israel J. Math. 96 (1996), 419–429.
  9. M. McLean, Lefschetz fibrations and symplectic homology, Geom. Topol. 13 (2009), no. 4, 1877–1944. arXiv:0709.1639.
  10. D. Varolin, The density property for complex manifolds and geometric structures, J. Geom. Anal. 11 (2001), no. 1, 135–160.
  11. D. Varolin, The density property for complex manifolds and geometric structures. II, Internat. J. Math. 11 (2000), no. 6, 837–847.