CoherentSheaf (*) -- sum of twists

Synopsis

Usage:
F(*)
Operator: (*)
Inputs:
- F, a coherent sheaf
Outputs:
- a symbolic representation of the graded object consisting of the twists F(n), for all integers n

i1 : R = QQ[x,y,z]

o1 = R

o1 : PolynomialRing

i2 : X = Proj R

o2 = X

o2 : ProjectiveVariety

i3 : Ext^0(OO_X^1, OO_X^1)

       1
o3 = QQ

o3 : QQ-module, free

i4 : Ext^0(OO_X^1, OO_X^1(*))

      1
o4 = R

o4 : R-module, free