“…Then, we form H = G −1 AG −H (3n 3 /2 flops) and run the J-Jacobi algorithm on the auxiliary pair (H, J) (4sn 3 flops, or less [13,Section 4], where s is the number of sweeps performed). For singular B, we use an auxiliary pair (B, A − µB) with nonsingular A − µB; for details, refer to [12,Remark 2.5].…”