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Hi all, when computing a certain Ext (a canonical module) of a homogenous equation with negative degrees, I get an unexpected zero.
i1 : S = QQ[X,T,Degrees=>{1,-1}] o1 = S o1 : PolynomialRing i2 : Ext^1(S^1/ideal(X*T-1), S^1) o2 = 0 o2 : S-module
This Ext should never be zero.
Note, if you set Degrees=>{1,-2} so it is not homogeneous, there is no problem (note, the answer should be S^1/ideal(X*T-1) up to some shift.
Degrees=>{1,-2}
S^1/ideal(X*T-1)
Doing it manually doesn't have a problem.
i1 : S = QQ[X,T,Degrees=>{1,-1}] o1 = S o1 : PolynomialRing i2 : myRes = res(S^1/ideal(X*T-1)) 1 1 o2 = S <-- S <-- 0 0 1 2 o2 : ChainComplex i3 : myResDual = Hom(myRes, S^1) 1 1 o3 = 0 <-- S <-- S -2 -1 0 o3 : ChainComplex i4 : HH^1(myResDual) o4 = cokernel | XT-1 | 1 o4 : S-module, quotient of S
That is, I get the right answer.
The text was updated successfully, but these errors were encountered:
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Hi all, when computing a certain Ext (a canonical module) of a homogenous equation with negative degrees, I get an unexpected zero.
This Ext should never be zero.
Note, if you set
Degrees=>{1,-2}
so it is not homogeneous, there is no problem (note, the answer should beS^1/ideal(X*T-1)
up to some shift.Doing it manually doesn't have a problem.
That is, I get the right answer.
The text was updated successfully, but these errors were encountered: