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In this article, we introduce a Laplacian for the reciprocal distance matrix of a connected graph, called the reciprocal distance Laplacian. Let $$\delta _1\ge \delta _2\ge \cdots \ge \delta _{n-1}\ge \delta _n$$ δ1≥δ2≥⋯≥δn-1≥δn be the reciprocal distance Laplacian spectrum. In this short note, we show that $$\delta _1\le n$$ δ1≤n with equality if and only if the complement graph $$\overline{G}$$...
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