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The general orthogonal group 
 is the Subgroup of all elements of the Projective General
Linear Group that fix the particular nonsingular Quadratic Form 
.  The determinant of such an element is 
.
See also Projective General Linear Group
References
Conway, J. H.; Curtis, R. T.; Norton, S. P.; Parker, R. A.; and Wilson, R. A.
  ``The Groups  
, 
, 
, and 
, and 
.''  §2.4 in 
  Atlas of Finite Groups: Maximal Subgroups and Ordinary Characters for Simple Groups.  Oxford, England:
  Clarendon Press, pp. xi-xii, 1985.