Equation Icon   m- c v ( x .v m-c V~ -------)x @tf + e V~ ------2-. \~/ xf - ct-----+ e mr 1 + |v|2 --. \~/ vf = 0, (31) 1 + |v| r r e- 2c(2rcr - 1) + 1 = 8pr2r, (32) - 2c 2 e (2rmr + 1) - 1 = 8pr p. (33)