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On the reciprocal distance Laplacian spectral radius of graphs | ||
Communications in Combinatorics and Optimization | ||
مقالات آماده انتشار، پذیرفته شده، انتشار آنلاین از تاریخ 21 تیر 1403 اصل مقاله (396.17 K) | ||
نوع مقاله: Original paper | ||
شناسه دیجیتال (DOI): 10.22049/cco.2024.29493.2024 | ||
نویسندگان | ||
Ummer Mushtaq؛ Shariefuddin Pirzada* | ||
Department of Mathematics, University of Kashmir, Srinagar, India | ||
چکیده | ||
The reciprocal distance Laplacian matrix of a connected graph $G$ is defined as $RD^L(G)=RTr(G)-RD(G)$, where $RTr(G)$ is the diagonal matrix whose $i$-th element $RTr(v_i)=\sum_{i\ne j\in V(G)} \frac{1}{d_{ij}}$ and $RD(G)$ is the Harary matrix. $RD^L(G)$ is a real symmetric matrix and we denote its eigenvalues as $\lambda_1(RD^L(G))\geq \lambda_2(RD^L(G))\geq\dots\geq\lambda_n(RD^L(G))$. The largest eigenvalue $\lambda_1(RD^L(G))$ of $RD^L(G)$ is called the reciprocal distance Laplacian spectral radius. In this paper, we obtain upper bounds for the reciprocal distance Laplacian spectral radius. We characterize the extremal graphs attaining this bound. | ||
کلیدواژهها | ||
Distance Laplacian matrix؛ reciprocal distance Laplacian matrix؛ Harary index؛ reciprocal distance Laplacian eigenvalues؛ reciprocal distance Laplacian spectral radius | ||
مراجع | ||
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