Abstract
Let \(F: \mathbb {R}^n\rightarrow \mathbb {R}^n\) be a \(C^{\infty }\) map such that DF(x) is invertible for every \(x\in \mathbb {R}^n\). Although being a local diffeomorphism, F is not necessarily globally injective if \(n\ge 2\). Finding additional assumptions implying the global injectivity of F for \(n\ge 2\) is object of intense study in several areas of mathematics. In this paper, we revisit some assumptions and relations between them in the bi-dimensional case and discuss the natural higher dimensional situation.
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Acknowledgements
We thank the referee for important comments that improved the presentation of the paper. The first author was partially supported by FAPESP Grants 10/11323-7, 2014/ 26149-3, and 2017/00136-0. The second and third author were partially supported by FAPESP Grants 07/08231-0 and 07/06896-5, respectively.
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Braun, F., dos Santos Filho, J.R. & Teixeira, M.A. Foliations, solvability, and global injectivity. Arch. Math. 119, 649–665 (2022). https://doi.org/10.1007/s00013-022-01789-z
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DOI: https://doi.org/10.1007/s00013-022-01789-z