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## Recent progress on the Jacobian Conjecture

### Tom 87 / 2005

Annales Polonici Mathematici 87 (2005), 1-11 MSC: Primary 14R15. DOI: 10.4064/ap87-0-1

#### Streszczenie

We describe some recent developments concerning the Jacobian Conjecture (JC). First we describe Drużkowski's result in [6] which asserts that it suffices to study the JC for Drużkowski mappings of the form $x+(Ax)^{*3}$ with $A^2=0$. Then we describe the authors' result of [2] which asserts that it suffices to study the JC for so-called gradient mappings, i.e. mappings of the form $x-\nabla f$, with $f\in k^{[n]}$ homogeneous of degree $4$. Using this result we explain Zhao's reformulation of the JC which asserts the following: for every homogeneous polynomial $f\in k^{[n]}$ (of degree $4$) the hypothesis ${\mit\Delta} ^m(f^m)=0$ for all $m\geq 1$ implies that ${\mit\Delta} ^{m-1}(f^m)=0$ for all large $m$ (${\mit\Delta}$ is the Laplace operator). In the last section we describe Kumar's formulation of the JC in terms of smoothness of a certain family of hypersurfaces.

#### Autorzy

• Michiel de BondtDepartment of Mathematics
University of Nijmegen
Postbus 9010
6500 GL Nijmegen, The Netherlands
e-mail
• Arno van den EssenDepartment of Mathematics
University of Nijmegen
Postbus 9010
6500 GL Nijmegen, The Netherlands
e-mail

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