We carefully examine one of the derivations of the renormalization group equation (RGE) for the so-called Vlow k potential, given by Bogner et al. [nucl-th/0111042]. The derivation, based on the completeness relation of the model space, must be modified if there are bound states. It is however shown that the RGE is unchanged if the bound state wavefunctions in the reduced theory are required to have the same low-momentum components as those in the original theory. Several aspects of the Vlow k approach are also discussed. firstname.lastname@example.org.
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