What reason did ABC give for the change in actor?q
The outer automorphism group of E6 ( " q " ) is the product of the diagonal automorphism group Z / gcd ( 3 , " q " −1 ) Z ( given by the action of E6 , ad ( " q " )) , the group Z / 2Z of diagram automorphisms , and the group of field automorphisms ( i.e. , cyclic of order " f " if " q " = " pf " where " p " is prime ) .