CoCalc -- 2-1

GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it

⁵⁶⁰⁹²² views

#g2 f1 z1 c1
  2x  2
  1  0
  0 -1

  2x  2
  0 -1
  1  0

  2x  2
  1  0
  0  1
2x2 %zentr
-1 0
0 -1
2x2 %centralizer
-1 0
0 -1
 2^3 = 8;