A sufficient condition in order that the real Jacobian conjecture in R^2 holds
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Let F=(f,g):R2→R2 be a polynomial map such that detDF(x,y) is different from zero for all (x,y)∈R2 and F(0,0)=(0,0). We prove that for the injectivity of F it is sufficient to assume that the higher homogeneous terms of the polynomials ffx+ggx and ffy+ggy do not have real linear factors in common.
The proofs are based on qualitative theory of dynamical systems.