i1 : X = Proj(QQ[x,y,z]) o1 = Proj(QQ[x,y,z]) o1 : ProjectiveVariety
i2 : F = OO_X(3) 1 o2 = sheaf((QQ[x,y,z]) ) o2 : CoherentSheaf
i3 : module F 1 o3 = (QQ[x,y,z]) o3 : QQ[x,y,z] - module, free
i4 : degrees oo o4 = {{-3}} o4 : List
See also CoherentSheaf.