THE COEFFICIENTS OF RK4
            using the notation of Fehlberg, Bettis, Horn, et alia


  k	         a[k]

  0    0
  1    1/3
  2    2/3
  3    1


  k	         c[k]

  0    1/8
  1    3/8
  2    3/8
  3    1/8


 k     j	  ß[k,j] 

 1    0    1/3
 2    0    -1/3
 2    1    1
 3    0    1
 3    1    -1
 3    2    1