ABSTRACT
In this chapter, the authors describe in the first lectures of the course, of the electrodynamic properties of hadrons as being measurements of properties of the current operators Jµ(1). They discuss the consequences of the interesting result in a moment. For interacting hadrons the commutator of currents is expected to be zero outside the light cone also, and non-zero only inside. Each general property of partons the authors assumed said something more explicit about the character of the singularity. There are many questions as to whether the detailed views of the parton model are correct for quarks. In particular, the question whether a single parton quark moving out in recoil need or need not take its non-integral quantum number with it.
