A few aspects of heavy quark expansion

Two topics in heavy quark expansion are discussed. The heavy quark potential in perturbation theory is reviewed in connection to the problem of the heavy quark mass. The non-trivial reason behind the failure of the `potential subtracted' mass in higher orders is elucidated. The heavy quark sum rules are the second subject. The physics behind the new exact sum rules is described and a simple quantum mechanical derivation is given. The question of saturation of sum rules is discussed. A comment on the non-standard possibility which would affect analysis of BR sl ( B ) versus n c is made.