Meromorphic functions together with their partial derivatives sharing zeros and poles in $\mathbb{C}^m$

Abstract

In the paper, using Nevanlinna's value distribution theory of meromorphic functions in $\mathbb{C}^m$, we study the problem: Let $f$ and $g$ be two finite order non-constant meromorphic functions in $\mathbb{C}^m$ such that $f$ and $g$ share $0$ and $\infty$ CM. If $\partial_{z_i}(f)$ and $\partial_{z_i}(g)$ share $0$ CM and if for one $n>1$, $\partial^n_{z_i}(f)$ and $\partial^n_{z_i}(g)$ share $0$ CM, where $i=1,2,\ldots,m$, then $f$ and $g$ have special presentations. Our finding extends the result of Köhler (Meromorphic functions sharing zeros and poles and also some of their derivatives sharing zeros, Complex Var., 11 (1989), 39-48) into higher dimensions. Moreover, we show by an example that the restriction on the growth of $f$ and $g$ is necessary.