A new bound for the spectral radius of Brualdi-Li matrices
Let B2m denote the Brualdi-Li matrix of order 2m, and let ρ2m = ρ(B2m ) denote the spectral radius of the Brualdi-Li Matrix. Then [...] . where m > 2, e = 2.71828 · · · , [...] and [...] .
A new bound on the domination number of graphs with minimum degree two.
A new characterization of the maximum genus of a graph
A New Characterization of Unichord-Free Graphs
Unichord-free graphs are defined as having no cycle with a unique chord. They have appeared in several papers recently and are also characterized by minimal separators always inducing edgeless subgraphs (in contrast to characterizing chordal graphs by minimal separators always inducing complete subgraphs). A new characterization of unichord-free graphs corresponds to a suitable reformulation of the standard simplicial vertex characterization of chordal graphs.
A new class of enumeration problems
A new class of infinite products, and Euler's totient.
A new class of -Fibonacci polynomials.
A new class of symmetric functions.
A New Class of Tilings with Two Prototiles
A new combinatorial identity.
A new construction for cancellative families of sets.
A new construction of the block systems B(4,1,25) and B(4,1, 28)
A new determinant expression of the zeta function for a hypergraph.
A new domino tiling sequence.
A new estimate for the vertex number of an edge-regular graph.
A new generating function of (-) Bernstein-type polynomials and their interpolation function.
A new like quantity based on “Estrada index”.
A new lower bound for the inducibility of a graph
A new lower bound on the density of vertex identifying codes for the infinite hexagonal grid.
A New Method for Computing the Eccentric Connectivity Index of Fullerenes
ACM Computing Classification System (1998): G.2.2, G.2.3.The eccentric connectivity index of the molecular graph G, ξ^c (G), was proposed by Sharma, Goswami and Madan. It is defined as ξ^c (G) = Σu∈V(G)degG(u) ecc(u), where degG(x) denotes the degree of the vertex x in G and ecc(u) = Max{d(x, u) | x ∈ V (G)}. In this paper this graph invariant is computed for an infinite class of fullerenes by means of group action.