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Algebraic varieties, stacks, sheaves, schemes, moduli spaces, complex geometry, quantum cohomology.
18
votes
Hironaka desingularisation theorem -- new proofs in literature?
you might be looking for Kollar's book Lectures on Resolution of Singularities
15
votes
Accepted
When is a scheme a zero-set of a section of a vector bundle?
As for the first question, the class of X has to be the product of the Chern roots of the bundle, so in the Chow ring, it is the class of a complete intersection.
As for the second question, you woul …
13
votes
Accepted
Moduli space of K3 surfaces
I think you are looking for this
http://arxiv.org/pdf/math/0506120
which is the same as:
Rizov, Jordan Moduli stacks of polarized $K3$ surfaces in mixed characteristic. Serdica Math. J. 32 (2006), …
12
votes
Accepted
Moduli spaces of complex curves as algebraic varieties
The classical (pre Deligne-Mumford) approach is to map $\mathcal{M}_g$ into $\mathcal{A}_g$ using the Torreli map. Whereas the classical way to see that $\mathcal{A}_g$ is quasi-projective is to defin …
10
votes
Italian school of algebraic geometry and rigorous proofs
The funniest example I know of is the number of conics tangent to five conics. There are now a number of different proofs, all based on modern intersection theory. Over the years, and until Fulton and …
9
votes
1
answer
1k
views
Visualizing a complex plane cubic together with the real plane
In Alain Roberts "Elliptic curves: notes from postgraduate lectures given in Lausanne 1971/72" page 11 (available on google books unless you already tried to read another chapter), there is a hand dra …
9
votes
Computing fundamental groups and singular cohomology of projective varieties
The trick I know (learned it from Ron Livne) is to project it to some space with known homotopy / homology, throw away the ramification and branch loci to get a covering map (and you better pray it's …
9
votes
Etale cohomology -- Why study it?
One of the annoying aspects with sheaf cohomology in algebraic geometry is that - even for curves over the complex numbers - the cohomological dimensions are not what you want them to be, if you are u …
8
votes
Accepted
K3 over fields other than C?
The "standard" definition of a K3 surface is field independent (unless you are a physicist):
$p_g=1, q=0$, and trivial canonical class.
Some results:
Mumford and Bombieri showed that you get (just …
8
votes
Why is a variety of general type hyperbolic?
you can blow up a point on a general type surface, and get a general type surface containing a copy of C.
7
votes
The importance of EGA and SGA for "students of today"
Regarding EGA, I think the most appropriate answer is: "wy bother ?". Unless you have a really special interest, you shouldn't.
Edit
Expanding on this (it seems a lot of people seems it's just flame …
7
votes
3
answers
1k
views
How many independent quadrics should one intersect to get the canonical curve.
Let $C$ be a non hyperelliptic complex algebraic curve of genus $g$, then the vector space $I_2(C)$ of quadrics containing the canonical image of $C$ is $\binom{g+1}{2}-h^0(2\omega_C) = (g-2)(g-3)/2$ …
6
votes
Geometry Vs Arithmetic of schemes
Look at Dan Abramovich's Birational geometry for number theorists
5
votes
Invariants of higher genus curves
AFAIK, these are know only up to genus 3.
Genus 2: Igusa (classical).
Hyperelliptic genus 3: Shioda (classical).
Non hyperelliptic genus 3: a decade ago by Dixmier & Ohno - see https://www.win.tue.n …
5
votes
Do there exist modern expositions of Klein's Icosahedron?
There is the outrageously expensive "Geometry of the quintic" by Jerry Shurman, which discusses both Klein and Doyle-McMullen approaches (and then some more).