4 papers
Quadratic Embedding Constants of Cartesian Products and Joins of Graphs
Projesh Nath Choudhury, Raju Nandi
The quadratic embedding constant (QEC) of a finite, simple, connected graph originated from the classical work of Schoenberg [Ann. of Math., 1935] and [Trans. Amer. Math. Soc., 193…
Matrices with simple symmetric digraphs and their group inverses
Raju Nandi
A new class of simple symmetric digraphs called is defined and studied here. Any digraph in has the property that each non-pendant vertex is adjacent to…
Quadratic embedding constants of graphs: Bounds and distance spectra
Projesh Nath Choudhury, Raju Nandi
The quadratic embedding constant (QEC) of a finite, simple, connected graph is the maximum of the quadratic form of the distance matrix of on the subset of the unit sphere…
Group Inverses of Weighted Trees
Raju Nandi
Let be an undirected weighted graph. The group inverse of is the weighted graph with the adjacency matrix , where is the adjacency matrix of . We…