Abstract In this paper we provide a criterion for bi-Lipschitz and differential {R} -sufficiency of filtered jets of maps in the context of Newton filtration, taking into account the effect of a singular metric. We adopt a singular metric which is a generalization of another one used by O. M. Abderrahmane in the characterization of {V} -sufficiency from the Newton filtration point of view.
Júnior et al. (Mon,) studied this question.