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The general linear group 
 is the set of 
 Matrices with entries in the
Field 
 which have Nonzero Determinant.
See also Langlands Reciprocity, Projective General Linear Group, Projective Special Linear Group, Special Linear Group
References
Conway, J. H.; Curtis, R. T.; Norton, S. P.; Parker, R. A.; and Wilson, R. A.
  ``The Groups  
, 
, 
, and 
.''  §2.1 in 
  Atlas of Finite Groups: Maximal Subgroups and Ordinary Characters for Simple Groups.  Oxford, England:
  Clarendon Press, p. x, 1985.