Avoiding C4 or K_{2,t} in the complement guarantees positive Lin-Lu-Yau curvature on graphs meeting explicit size bounds, with the bounds optimal for t at least 10.
Hehl, A condition for non-negative Lin–Lu–Yau curvature, arXiv: 2502.03896
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Criteria on forbidden subgraphs in the complements for positive Lin--Lu--Yau curvature
Avoiding C4 or K_{2,t} in the complement guarantees positive Lin-Lu-Yau curvature on graphs meeting explicit size bounds, with the bounds optimal for t at least 10.