On definable open continuous mappings

Si Tiep Dinh; Tien Son Pham

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arXiv · 2106.01593

On definable open continuous mappings

Si Tiep Dinh·Tien Son Pham

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Abstract

For a definable continuous mapping $f$ from a definable connected open subset $\Omega$ of $\mathbb R^n$ into $\mathbb R^n,$ we show that the following statements are equivalent: (i) The mapping $f$ is open. (ii) The fibers of $f$ are finite and the Jacobian of $f$ does not change sign on the set of points at which $f$ is differentiable. (iii) The fibers of ${f}$ are finite and the set of points at which $f$ is not a local homeomorphism has dimension at most $n - 2.$ As an application, we prove that Whyburn's conjecture is true for definable mappings: A definable open continuous mapping of one closed ball into another which maps boundary homeomorphically onto boundary is necessarily a homeomorphism.

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Si Tiep Dinh, Tien Son Pham. 2021-06-03. On definable open continuous mappings. https://arxiv.org/abs/2106.01593

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