Hom(E,F)
i1 : X = abstractProjectiveSpace 1 o1 = X o1 : a flag bundle with subquotient ranks {2:1}
i2 : Hom(OO_X(3),OO_X) o2 = a sheaf o2 : an abstract sheaf of rank 1 on X
i3 : chi oo o3 = -2