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The Real Jacobian Conjecture for polynomials of degree 3

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We show that every local polynomial diffeomorphism (f,g) of the real plane such that deg f ≤ 3, deg g ≤ 3 is a global diffeomorphism.
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Growth at infinity of a polynomial with a compact zero set

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A polynomial with 2k critical values at infinity

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EN
We construct a polynomial f:ℂ² → ℂ of degree 4k+2 with no critical points in ℂ² and with 2k critical values at infinity.
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The Łojasiewicz gradient inequality in a neighbourhood of the fibre

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EN
Some estimates of the Łojasiewicz gradient exponent at infinity near any fibre of a polynomial in two variables are given. An important point in the proofs is a new Charzyński-Kozłowski-Smale estimate of critical values of a polynomial in one variable.
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On the approximate roots of polynomials

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We give a simplified approach to the Abhyankar-Moh theory of approximate roots. Our considerations are based on properties of the intersection multiplicity of local curves.
EN
For every polynomial F in two complex variables we define the Łojasiewicz exponents $ℒ_{p,t}(F)$ measuring the growth of the gradient ∇F on the branches centered at points p at infinity such that F approaches t along γ. We calculate the exponents $ℒ_{p,t}(F)$ in terms of the local invariants of singularities of the pencil of projective curves associated with F.
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