The relativistic two- and three-quark problems

For theqqq problem, the corresponding covariant-instantaneity-ansatz dynamics is formulated through the introduction of new Lorentz-invariant momenta, which again are closely parallel to the older null-plane-ansatz treatment for the same on a two-tier basis, but facilitate a derivation of the 3-dimensional Bethe-Salpeter equation in a more general form for unequal-mass kinematics than seem to have been attempted previously.