Take the 2-minute tour ×
MathOverflow is a question and answer site for professional mathematicians. It's 100% free, no registration required.

Let R be an augmented regular local ring over a field $k$ with maximal ideal m. There is the Grothendieck residue symbol:

$$Res: H^n_m(\Omega^n) \to k$$

If $k=\mathbb{C}$ and $R$ is affine space, this map has a well-known interpretation by way of an integral formula.

If X is a projective scheme over $\mathbb{C}$, there is the Serre-duality trace $$ tr: H^n(\omega) \to \mathbb{C}$$ which at least when $X$ is smooth can be represented similarly in terms of integrals. My question is whether there is a way to combine these two ideas namely suppose $X$ is a smooth quasi-projective variety over $\mathbb{C}$ and $Z$ a proper subscheme, can we define a trace:

$$ tr/Res: R^n\Gamma_{Z}(\Omega_X^n) \to \mathbb{C} $$

Is there a description for this map in terms of integrals?

Most of the literature on residues, Grothendieck duality and the like is way too heavy for me. Where is this written up in a friendly way?

Edit: Proposition 2.3.2 or Remark 2.3.8 of http://www.math.purdue.edu/~lipman/papers/formal-duality.pdf seem close to what I want (or maybe are exactly what I would like). Still, I would be happy if there is a more simple minded reference with some analytic treatment.

share|improve this question
1  
What does augmanted mean in the context of regular local rings? –  Mahdi Majidi-Zolbanin Jul 11 '13 at 21:44
1  
I have edited it to indicate that it's also a k-algebra. Then augmented just means that the residue field is also $k$. –  user36931 Jul 12 '13 at 0:39
1  
In the last displayed equation I think it should be $$R^n \Gamma_Z(\Omega_X^n)$$ not $R\Gamma_Z^n(\Omega_X^n)$, right? –  Karl Schwede Jul 12 '13 at 8:46
    
Yes, corrected. –  user36931 Jul 12 '13 at 16:39
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Browse other questions tagged or ask your own question.