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Non-degeneracy and Fibering with Applications to Diophantine Approximation

Abstract

Motivated by applications in Diophantine approximation, we develop a new fibering mechanism for non-degenerate manifolds in ℝn, showing that they admit local decompositions into families of non-degenerate curves with uniform quantitative non-degeneracy properties. The manifolds are required to be CN with the essentially optimal bound N≥ max{ n,l+1}, where the manifold is l non-degenerate. Furthermore, we show that this uniform quantitative local control can be globalised into a qualitative statement, so that almost every point of a non-degenerate manifold lies on a non-degenerate curve contained in the manifold. Our approach is perturbative and shows that the fibering structure arising in the analytic setting is stable under sufficiently small CN perturbations. The method provides a framework for extending fibering based results in Diophantine approximation from curves to manifolds. Such applications are considered in the paper.

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BibTeX
@misc{zhao2026nondegeneracy,
  title = {{Non-degeneracy and Fibering with Applications to Diophantine Approximation}},
  author = {ZiAn Cody Zhao},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.10799},
  eprint = {2610.10799},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.10799},
}
RIS
TY  - UNPB
TI  - Non-degeneracy and Fibering with Applications to Diophantine Approximation
AU  - ZiAn Cody Zhao
PY  - 2026
DA  - 2026/10/07
PB  - arXiv
DO  - 10.48550/arxiv.2610.10799
UR  - https://arxiv.org/abs/2610.10799
AB  - Motivated by applications in Diophantine approximation, we develop a new fibering mechanism for non-degenerate manifolds in ℝ^n, showing that they admit local decompositions into families of non-degenerate curves with uniform quantitative non-degeneracy properties. The manifolds are required to be C^N with the essentially optimal bound N≥ max{ n,l+1}, where the manifold is l non-degenerate. Furthermore, we show that this uniform quantitative local control can be globalised into a qualitative statement, so that almost every point of a non-degenerate manifold lies on a non-degenerate curve contained in the manifold. Our approach is perturbative and shows that the fibering structure arising in the analytic setting is stable under sufficiently small C^N perturbations. The method provides a framework for extending fibering based results in Diophantine approximation from curves to manifolds. Such applications are considered in the paper.
ER  -