The projective special linear group 
is the group obtained from
the special linear group 
on factoring by the scalar
matrices contained in that group. It is simple
for 
except for
 |  |  |
(1)
|
 |  |  |
(2)
|
and is therefore also denoted 
.
Projective Special Linear Group
See also
Projective Special Orthogonal Group, Projective Special Unitary Group, Special Linear GroupExplore with Wolfram|Alpha
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.Referenced on Wolfram|Alpha
Projective Special Linear GroupCite this as:
Weisstein, Eric W. "Projective Special Linear Group." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/ProjectiveSpecialLinearGroup.html