We consider a simple connected graph Gn on n nodes for which the determinant
of the adjacency matrix A(Gn) satisfies the property
det(A(Gn)) = (−1)
n−1(n − 1). (1)
For example, if we denote the n × n matrix with each entry equal to 1 by Jn, and
the n × n identity matrix by In, then the adjacency matrix for the complete graph