Graphs with nonnegative Bakry-Émery curvature without Quadrilateral

The definition of Ricci curvature on graphs in Bakry-Émery’s sense based on curvature dimension condition was introduced by Lin and Yau [\emph{Math. Res. Lett.}, 2010]. Hua and Lin [\emph{Comm. Anal. Geom.}, 2019] classified unweighted graphs satisfying the curvature dimension condition $CD(0,\mathrm{\infty })$ whose girth are at least five. In this paper, we classify all of connected unweighted normalized $C_4$-free graphs satisfying curvature dimension condition $CD(0,\mathrm{\infty })$ for minimum degree at least 2 and the case with non-normalized Laplacian without degree condition…