i1 : R = ZZ/101[a..c];
i2 : f = vars R o2 = | a b c | 1 3 o2 : Matrix R <--- R
We can easily compute a kernel, image or cokernel.
i3 : ker f o3 = image {1} | 0 -b -c | {1} | -c a 0 | {1} | b 0 a | 3 o3 : R-module, submodule of R
i4 : coker f o4 = cokernel | a b c | 1 o4 : R-module, quotient of R
i5 : image f o5 = image | a b c | 1 o5 : R-module, submodule of R