Mixed Bruce-Roberts numbers

Abstract

We extend the notion of ${\mu }^{\ast }$-sequence and Tjurina number of functions to the framework of Bruce-Roberts numbers, that is, to pairs formed by the germ at $0$ of a complex analytic variety $X\subseteq {\mathbb{C}}^n$ and a finitely $\mathcal{R}(X)$-determined analytic function germ $f:({\mathbb{C}}^n,0)\to (\mathbb{C},0)$. We analyze some fundamental properties of these numbers.