This survey lists all papers on graph energies, known to the authors, published in 2019, and
summarizes their main collective characteristics. In addition to new mathematical results, in …

Quadrant Interlocking Factorization (QIF), an alternative to LU factorization, is suitable for
factorizing invertible matrix A such that det (A), 0. The QIF, with its application in parallel …

Graph theory is one of the neglected branches of mathematics in Nigeria but with the most
applications in other fields of research. This article shows the paucity, importance, and …

Goldreich-Goldwasser-Halevi (GGH) encryption scheme is lattice-based cryptography with
its security based on the shortest vector problem (SVP) and closest vector problem (CVP) …

Hourglass matrix is recently shown to be a subset of Z-matrix which can be obtained from
Quadrant Interlocking Factorization (QIF) of nonsingular matrix. Unlike Z-matrix, the …

This article discusses a mixed graph called mixed hourglass graph. The adjacency of a
mixed hourglass graph is coined from an hourglass matrix in which the matrix is obtained …

The graph of Hermitian-adjacency matrix is a mixed graph consisting adjacency matrix of an
undirected graph and skew-adjacency matrix of a digraph. In this paper we discuss …