What reason did ABC give for the change in actor?q
The Schur multiplier of E7 ( " q " ) is gcd ( 2 , " q " −1 ) , and its outer automorphism group is the product of the diagonal automorphism group Z / gcd ( 2 , " q " −1 ) Z ( given by the action of E7 , ad ( " q " )) and the group of field automorphisms ( i.e. , cyclic of order " f " if " q " = " pf " where " p " is prime ) .