Une note à propos du Jacobien de $n$ fonctions holomorphes à l'origine de $\mathbb{C}^n$

Details Une note à propos du Jacobien de $n$ fonctions holomorphes à l'origine de $\mathbb{C}^n$ Une note à propos du Jacobien de $n$ fonctions holomorphes à l'origine de $\mathbb{C}^n$

2008-02-04

arxiv.org/abs/0802.0426v1

Annales Polonici Mathematici (2008) 1-22

Mathematics

Algebraic Geometry

Scientific paper

Let $f_1,...,f_n$ be $n$ germs of holomorphic functions at the origin of $\mathbb{C}^n$ such that $f_i(0)=0$, $1\leq i\leq n$. We give a proof based on the J. Lipman's theory of residues via Hochschild Homology that the Jacobian of $f_1,...,f_n$ belongs to the ideal generated by $f_1,...,f_n$ belongs to the ideal generated by $f_1,...,f_n$ if and only if the dimension ot the germ of common zeos of $f_1,...,f_n$ is sttrictly positive. In fact we prove much more general results which are relatives versions of this result replacing the field $\mathbb{C}$ by convenient noetherian rings $\mathbf{A}$ (c.f. Th. 3.1 and Th. 3.3). We then show a \L ojasiewicz inequality for the jacobian analogous to the classical one by S. \L ojasiewicz for the gradient.

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