Surjective mappings whose differential is nowhere surjective
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- by Y. Yomdin PDF
- Proc. Amer. Math. Soc. 111 (1991), 267-270 Request permission
Abstract:
Examples of ${C^k}$-mappings $f:{\mathbb {R}^n} \to {\mathbb {R}^m},n \geq m > 2$, are given, with rank $df(x) \leq s$ at any $x \in {\mathbb {R}^n},2 \leq s < m$, but $f({\mathbb {R}^n}) = {\mathbb {R}^m}$, for any $k < (n - s + 2)/(m - s + 2)$. Thus a weak form of Sard’s theorem (if all the points in the source are critical, the image has measure zero) does not hold for mappings of low smoothness.References
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Additional Information
- © Copyright 1991 American Mathematical Society
- Journal: Proc. Amer. Math. Soc. 111 (1991), 267-270
- MSC: Primary 58C25
- DOI: https://doi.org/10.1090/S0002-9939-1991-1039267-2
- MathSciNet review: 1039267