/* www-ATLAS of Group Representations. SL2(7) represented as 4 x 4 matrices over GF(9). */ F:=GF(9); x:=CambridgeMatrix(1,F,4,[ "0100", "2000", "0001", "0020"]); y:=CambridgeMatrix(1,F,4,[ "0010", "7130", "2020", "1081"]); G:=MatrixGroup<4,F|x,y>; print "Group G is SL2(7) < GL(4,GF(9))";