Get the double-dual (S2 - identification) of a module
i1 : R = QQ[x,y,z]/ideal(x^2-y*z) o1 = R o1 : QuotientRing |
i2 : m = ideal(x,y,z) o2 = ideal (x, y, z) o2 : Ideal of R |
i3 : prune reflexifyModule(m*R^2)
2
o3 = R
o3 : R-module, free
|
i4 : I = ideal(x,y) o4 = ideal (x, y) o4 : Ideal of R |
i5 : prune reflexifyModule(I*R^1)
o5 = cokernel {1} | x -y |
{1} | -z x |
2
o5 : R-module, quotient of R
|
i6 : prune reflexifyModule(I^2*R^1)
1
o6 = R
o6 : R-module, free, degrees {1}
|