1. Lamb Shift in a Strong Coulomb Potential
2. The following exercise of calculating the interactional energy between two fixed charges may be found explicitly and implicitly in the published and unpublished literature. In particular, see the beautiful lectures by V. N. Gribov at the 12th Winter School of the Leningrad Nuclear Physics Institute, 1977, which Dr. Nigel Parsons called to my attention after I discussed this approach at Oxford University in the spring of 1979 while I was on sabbatical leave from SLAC. (An English translation of these lectures was issued as SLAC-Trans-176, further compounding my embarrassment.) More recently, a detailed analysis of the quark-antiquark static potential in QCD has been given by Daniel Stump (University of Indiana, in preparation). See also: Khriplovich, I. B. 1969. Yad. Fiz. 10: 409 (1970. Sov. J. Nucl. Phys. 10: 235); Altukhov, A. M. & I. B. Khriplovich. 1970. Yad. Fiz. 11: 902 (1970. Sov. J. Nucl. Phys. 11: 504); Duncan, A. 1976. Phys. Rev. D 13: 2866; Appelquist, T., M. Dine & I. J. Muzinich. 1977. Phys. Lett. 69B: 231; 1978. Phys. Rev. D8: 2074; Feinberg, F. 1977. Phys. Rev. Lett. 39: 316; 1978. Phys. Rev. D 17: 2659; Frenkel, J. & J. C. Taylor. 1978. Oxford University Preprint; 1979. Erratum; Cahill, K. & D. Stump. 1979. Indiana University Preprint (IUHET-37). I am also familiar with unpublished work by: Bjorken, J. D. & by Giles, R. For a qualitative description see Weisskopf, V. 1974. International School of Subnuclear Physics. A. Zichichi, Ed. 12: 307
3. Equation 23 shows that when n f ≥ 17 flavors, the criterion for asymptotic freedom is violated
4. I thank Richard Hughes of Oxford University for valuable discussions on the extension to higher orders and the possibility of deriving the renormalization group results