  The standard approach to nuclear physics encodes phase shift information in
an NN potential, then decodes that information in forming an effective
interaction, appropriate to a low-momentum Hilbert space. Here we show that it
is instead possible to construct the effective interaction directly from
continuum phase shifts and mixing angles, eliminating all reference to a high
momentum potential. The theory is rapidly convergent and well behaved, yielding
sub-keV accuracy.
