Abstract
Any residual polynomial of hybrid Bi-Conjugate Gradient (Bi-CG) methods, as Bi-CG STABilized (Bi-CGSTAB), BiCGstab(ℓ)BiCGstab(ℓ), Generalized Product-type Bi-CG (GPBiCG), and BiCG×MR2BiCG×MR2, can be expressed as the product of a Lanczos polynomial and a so-called stabilizing polynomial. The stabilizing polynomials of GPBiCG have originally been built by coupled two-term recurrences, but, as
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