Published online by Cambridge University Press: 18 December 2014
(0.1)\begin{equation}\label{eq:0.1}\left\{\begin{array}{ll}\displaystyle-\Delta_{\mathbb{H}^{N}}u=|v|^{p-1}v x, \\\displaystyle-\Delta_{\mathbb{H}^{N}}v=|u|^{q-1}u, \\\end{array}\right.\end{equation}