Bound-valence-quark contributions to hadron structure functions.

The conventional separation of " valence " and " sea " quark distributions of a hadron implicitly assumes that the quark and anti-quark contributions to the sea are identical in shape, although this cannot be strictly correct due to the exclusion principle. A new sepnration of " bound va.lence " and " non-valence " quark distributions of a hadron is proposed which incorporates the Pauli principle and relates the valence component to the wave-functions of the bound-state valence constituents. With this new definition, the non-valence quark distributions correspond to structure functions which would be measured if the valence quarks of the target hadron were charge-less. The bound valence-quark distributions are not singular at small 2, thus allowing for the calculation of sum rules and expectation values which would otherwise be divergent.