The potentials $V (v)$ in the nonrelativistic (relativistic) nucleon-nucleon(NN) Schroedingerequation are related by a quadratic equation. That equation isnumerically solved, thus providing phase equivalent v- potentials related forinstance to the high precision NN potentials, which are adjusted to NN phaseshift and mixing parameters in a nonrelativistic Schroedinger equation. Therelativistic NN potentials embedded in a three-nucleon (3N)system for total NNmomenta different from zero are also constructed in a numerically precisemanner. They enter into the relativistic interacting 3N mass operator, which isneeded for relativistic 3N calculations for bound and scattering states.
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