i1 : A= matrix {{-1, -1, -1}, {1, 0, 0}, {0, 1, 0}, {0, 0, 1}}
o1 = | -1 -1 -1 |
| 1 0 0 |
| 0 1 0 |
| 0 0 1 |
4 3
o1 : Matrix ZZ <--- ZZ
|
i2 : c1=cokerElement(vector {1,1,0,0},A)
o2 = | 2 |
| 0 |
| 0 |
| 0 |
o2 : cokernel | -1 -1 -1 |
| 1 0 0 |
| 0 1 0 |
| 0 0 1 |
|
i3 : c2=cokerElement(vector {1,-1,0,0},A)
o3 = 0
o3 : cokernel | -1 -1 -1 |
| 1 0 0 |
| 0 1 0 |
| 0 0 1 |
|