On the injectivity of C1 maps of the real plane
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Abstract
Let X : ℝ2 → ℝ2 be a C1 map. Denote by Spec(X) the set of (complex) eigenvalues of DXp when p varies in ℝ2. If there exists ε > 0 such that Spec(X) ∩ (-ε, ε) = ∅, then X is injective. Some applications of this result to the real Keller Jacobian conjecture are discussed.
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Canadian Journal of Mathematics, v. 54, n. 6, p. 1187-1201, 2002.
