“…Let h(λ) = λ n + cn−1( pi, pj, Gi,j,r)λ n−1 + · · ·+c0( pi, pj, Gi,j,r) be the characteristic polynomial of Qijr. To make Vi,j( z, pi, pj, Gi,j,r) = z T Qijr z ≥ 0 for all z ∈ R n−1 , due to the Descartes rule [24], it is equivalent to finding pi and pj such that Λ3,i,j,r( pi, pj ) holds, where…”