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Full-Text Articles in Physical Sciences and Mathematics
Foliations And Global Inversion, Eduardo C. Balreira
Foliations And Global Inversion, Eduardo C. Balreira
Eduardo Cabral Balreira
We consider topological conditions under which a locally invertible map admits a global inverse. Our main theorem states that a local diffeomorphism f : M → Rn is bijective if and only if Hn−1(M) = 0 and the pre-image of every affine hyperplane is non-empty and acyclic. The proof is based on some geometric constructions involving foliations and tools from intersection theory. This topological result generalizes in finite dimensions the classical analytic theorem of Hadamard-Plastock, including its recent improvement by Nollet-Xavier. The main theorem also relates to a conjecture of the aforementioned authors, involving the well known Jacobian Conjecture in …
Incompressibility And Global Inversion, Eduardo C. Balreira
Incompressibility And Global Inversion, Eduardo C. Balreira
Eduardo Cabral Balreira
Given a local diffeomorphism f : ℝn → ℝn, we consider certain in- compressibility conditions on the parallelepiped D f (x) ([0, 1]n) which imply that the pre-image of an affine subspace is non-empty and has trivial homotopy groups. These conditions are then used to establish criteria for f to be globally invertible, generalizing in all dimensions the previous results of M. Sabatini.