Sign-preserving solutions to the Tzitzéica equation on lattice graphs

Abstract

On the lattice graph $\mathbb{Z}^n$, we establish the existence of sign-preserving solutions to the Tzitzéica equation. We prove the existence of positive solutions and two classes of negative solutions under different assumptions, and derive their decay estimates. The proof is based on a suitable approximation scheme, the monotone convergence theorem, and an exhaustion argument. These results extend those of Hua, Huang, and Wang (Anal. PDE, 2026) by establishing the existence of both positive and negative sign-preserving solutions together with their decay estimates.