The projective general orthogonal group 
is the group obtained from
the general orthogonal group 
on factoring the scalar matrices
contained in that group.
Projective General Orthogonal Group
See also
General Orthogonal Group, Projective General Linear Group, Projective General Unitary GroupExplore with Wolfram|Alpha
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.Referenced on Wolfram|Alpha
Projective General Orthogonal GroupCite this as:
Weisstein, Eric W. "Projective General Orthogonal Group." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/ProjectiveGeneralOrthogonalGroup.html