CoCalc -- 3;2-1

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

⁵⁶⁰⁹²² views

#1

5x5
0 0 0 1 -1
0 0 0 1 0
0 0 1 0 -1
1 1 -1 0 0
-1 1 0 0 0

dim5/3;2-1a