Dirac's Equation in Different Numerical Rings
  Dirac's equations are formulated in a consistent way by using only elements from each of R, C, and H. In H, the quaternions, the symmetry resulting from a "single" conjugation (i, j, or k) results in three conserved currents - possibly associated with "color." The role that the numerical field plays is discussed and speculated on. 
Lester C. Welch