Ground state sign-changing solutions for second order elliptic equation with logarithmic nonlinearity on locally finite graphs

Abstract

We obtain the existence results of ground state sign-changing solutions and ground state solutions for a class of second order elliptic equation with logarithmic nonlinearity on a locally finite graph $G=(V,E)$, and obtain the sign-changing ground state energy is larger than twice of the ground state energy. The method we used is a direct non-Nehari manifold method in [X.H. Tang, B.T. Cheng. J. Differ. Equations. 261(2016), 2384-2402.