Eq. (2.1) — the positive part $g$ of a $\lambda(G)$-eigenvector satisfies $\lambda \ge \sum_{uv\in E}(g(u)-g(v))^2/\sum_v g^2(v)$

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Eq. (2.1) — the positive part $g$ of a $\lambda(G)$-eigenvector satisfies $\lambda \ge \sum_{uv\in E}(g(u)-g(v))^2/\sum_v g^2(v)$ · Prove2Me