-- -*- M2-comint -*- {* hash: 1843064510 *} 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 | i4 : c2==(0_(class c2)) o4 = true i5 : iszero c2 o5 = true i6 : iszero c1 o6 = false i7 :