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Transactions of the American Mathematical Society
Transactions of the American Mathematical Society
ISSN 1088-6850(online) ISSN 0002-9947(print)

 

Hessian nilpotent polynomials and the Jacobian conjecture


Author: Wenhua Zhao
Journal: Trans. Amer. Math. Soc. 359 (2007), 249-274
MSC (2000): Primary 33C55, 39B32, 14R15, 31B05
Published electronically: July 20, 2006
MathSciNet review: 2247890
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Abstract: Let $ z=(z_1,\cdots,z_n)$ and let $ \Delta=\sum_{i=1}^n \frac{\partial^2}{\partial z^2_i}$ be the Laplace operator. The main goal of the paper is to show that the well-known Jacobian conjecture without any additional conditions is equivalent to what we call the vanishing conjecture: for any homogeneous polynomial $ P(z)$ of degree $ d=4$, if $ \Delta^m P^m(z)=0$ for all $ m \geq 1$, then $ \Delta^m P^{m+1}(z)=0$ when $ m>>0$, or equivalently, $ \Delta^m P^{m+1}(z)=0$ when $ m> \frac{3}{2}(3^{n-2}-1)$. It is also shown in this paper that the condition $ \Delta^m P^m(z)=0$ ($ m \geq 1$) above is equivalent to the condition that $ P(z)$ is Hessian nilpotent, i.e. the Hessian matrix $ \mathrm{Hes}\,P(z)=(\frac{\partial^2 P}{\partial z_i\partial z_j})$ is nilpotent. The goal is achieved by using the recent breakthrough work of M. de Bondt, A. van den Essen and various results obtained in this paper on Hessian nilpotent polynomials. Some further results on Hessian nilpotent polynomials and the vanishing conjecture above are also derived.


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Additional Information

Wenhua Zhao
Affiliation: Department of Mathematics, Illinois State University, Normal, Illinois 61790-4520
Email: wzhao@ilstu.edu

DOI: http://dx.doi.org/10.1090/S0002-9947-06-03898-0
PII: S 0002-9947(06)03898-0
Keywords: Hessian nilpotent polynomials, deformed inversion pairs, the heat equation, harmonic polynomials, the Jacobian conjecture.
Received by editor(s): October 15, 2004
Received by editor(s) in revised form: October 26, 2004
Published electronically: July 20, 2006
Article copyright: © Copyright 2006 American Mathematical Society
The copyright for this article reverts to public domain 28 years after publication.