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Parton distributions from an operator viewpoint.

Spin-dependent quark and gluon distribution functions are derived in terms of light-cone correlation functions. The first moment of the gluon asymmetry {Delta}{ital g} is shown to be related to the Chern-Simons current {ital K}{sup {mu}}. Renormalization and factorization ambiguities and their implication for the {ital g}{sub 1} problem are discussed.