Tag: divisors

30 Are there topological versions of the idea of divisor? 2017-06-12T06:11:25.033

29 Which 'well-known' algebraic geometric results do not hold in characteristic 2? 2011-07-06T12:42:04.690

19 Elementary Proof of Riemann-Roch for Compact Riemann Surfaces 2016-10-26T00:59:47.280

18 blowing up, -1 curves, effective and ample divisors 2010-03-01T21:45:38.763

16 does a line bundle always have a degree 2009-10-10T08:34:40.453

16 Bertini theorems for base-point-free linear systems in positive characteristics 2011-06-09T00:06:12.190

15 Elementary short exact sequence of sheaves 2011-04-26T18:23:47.983

15 Generalization of the rigidity lemma in birational geometry 2016-02-07T14:27:16.197

14 Contracting divisors to a point 2010-05-13T13:15:37.313

14 Seeking Noetherian normal domain with vanishing Picard group but not a UFD 2010-05-24T09:32:37.780

13 Birational automorphisms of varieties of Picard number one 2017-11-22T21:15:27.017

12 Relative canonical divisors 2010-10-28T04:50:54.173

12 Ample divisors on projective surfaces 2011-10-17T03:11:48.510

11 Blow-ups of $\mathbb{P}^{n-3}$ and $(\mathbb{P}^1)^{n-3}$ 2014-12-21T14:15:33.080

10 The canonical line bundle of a normal variety 2010-08-16T09:06:18.753

10 Is there a divisor in $\mathbb P^2$ such that all analytic maps into its complement algebraize? 2016-06-01T15:22:23.253

9 Effectiveness of the distinguished theta characteristic in characteristic 2 2013-08-18T05:27:30.567

9 Blowing-up a point in the singular locus 2015-02-27T03:26:28.430

9 Fibrations of projective varieties 2015-04-12T18:34:15.173

9 Number of conditions imposed by fat points to a linear system 2016-09-23T22:30:04.010

9 Intersection numbers in $\mathbb{P}^1$-bundles 2017-10-09T22:05:21.457

8 Anticanonical divisor of the blow up of P^2 in 9 points 2009-11-19T15:03:09.637

8 Base locus of divisors on blowings up of the projective space 2010-10-01T08:57:20.240

8 Why is (line bundle, appropriate rational section) not a standard kind of divisor? 2011-01-28T04:22:40.233

8 Does combining Abhyankar's Lemma and embedded resolution give horizontal normal crossings 2011-04-07T14:40:14.027

8 Cone of movable curves 2011-10-25T00:08:36.857

8 Numerically equivalent effective divisors and semiampleness 2012-03-06T09:50:08.663

7 Cones, monoids, and the space of (very) ample divisors 2011-03-31T12:45:20.890

7 Cone of effective divisors! 2011-06-16T15:37:33.910

7 Irreducible divisors containing an arbitrary closed set 2013-01-17T09:02:43.360

7 Bertini's Theorem 2014-03-15T23:26:55.720

7 Is $n=6$ the only integer satisfies ${\sigma}_x(n) \equiv 0\bmod{n}$ for every odd integer $x > 0$ and $2 (\bmod n)$ if $x$ is even integer? 2016-01-01T23:53:37.383

7 How do i show that:$\prod\frac{p^2+1}{p^2-1}=\frac{5}{2}$ without using properties of Riemann zeta function? 2016-01-19T23:10:43.213

7 Picard groups and birational morphisms 2016-11-21T15:29:40.067

7 When is $ \sigma(n!-1) $ a perfect square? 2016-11-24T19:27:50.187

7 Degree of equations of secant varieties of Veronese varieties 2016-12-15T22:30:43.690

7 Pencils on del Pezzo surfaces 2017-09-07T14:31:32.253

7 Push-forward of nef divisors via finite morphisms 2017-10-14T16:09:06.867

7 On a smooth curve $C$, when is $K_C \sim_\mathbb{Q} (2g-2)P$? 2018-03-09T18:03:08.727

6 Stable base loci cannot contain isolated points 2011-01-19T21:22:47.783

6 Top self-intersection of exceptional divisors 2014-04-08T20:59:46.710

6 Cone over the Veronese surface 2014-12-30T14:42:15.900

6 Self-intersection of a Cartier divisor 2016-04-20T13:43:37.640

6 Fundamental groups of complements of divisors in $\mathbb P^2$ 2016-11-10T14:06:14.850

6 The kernel of a nef line bundle 2017-09-17T01:48:10.500

6 Blowing-up an ideal generated by squares 2017-11-09T00:22:09.630

6 Extremal rays in Picard rank two 2018-02-02T22:49:00.813

5 Weil divisors on non Noetherian schemes 2009-10-01T01:57:33.070

5 Is there a canonical notion of principal divisor on a discrete dynamical system? 2009-10-21T04:13:26.407

5 Nef divisors with few global sections 2010-04-13T14:07:29.543

5 Are there (-2)-curves on an Enriques surface? 2011-01-18T10:52:27.287

5 (Anti)Canonical divisor of a blow up 2011-09-13T07:47:46.947

5 Divisorial contraction: when is the image an algebraic space or a stack? 2012-08-28T07:36:43.393

5 Does $h^1(D)=0$ imply numerical connectedness on K3 surfaces? 2014-03-01T15:43:17.927

5 How close is $h^0(mD)$ to be a polynomial? 2017-02-04T03:54:36.370

5 The existence of the Drinfeld shtuka function 2017-06-06T15:21:55.207

5 Linear systems on moduli spaces of stable maps 2017-06-07T09:24:45.490

5 Anti-canonical divisor of a Fano variety 2017-10-02T21:33:11.887

5 Polynomials on spaces of matrices 2017-11-04T18:06:09.017

4 A working generalization of Weil divisors 2009-11-12T19:15:43.757

4 Special divisors on hyperelliptic curves 2010-04-21T05:22:28.497

4 Vague question on $Pic^0$ 2011-04-21T20:45:25.710

4 Ample divisors on blown-up projective space 2011-10-08T22:40:25.320

4 References about pseudoeffective cone 2011-10-14T09:59:10.757

4 Bertini's Theorem small print 2012-10-11T17:58:02.823

4 Extension of linear system 2013-10-23T15:20:55.683

4 Varieties with big anti-canonical divisor 2014-05-16T12:36:17.427

4 Canonical bundle of moduli space of rational curves and automorphisms 2014-09-24T19:51:45.293

4 Standard plane Cremona transformation 2014-12-12T10:33:43.297

4 A question on the effective cone 2015-02-23T21:24:34.650

4 Zeroes of global sections killed by differential operators 2016-04-25T12:59:56.120

4 A question on the Kodaira dimension of 3-folds 2017-07-02T22:40:34.427

4 Is the class (resp. Picard) group of a $G$-variety generated by invariant divisors? 2017-07-21T15:38:01.733

4 Is this divisorial contraction a blow-up? 2017-09-18T22:21:31.210

4 When does a Cartier divisor a pull-back of a Cartier divisor? 2018-01-30T14:53:50.807

3 Examples of divisors on an analytical manifold 2009-12-08T11:03:35.903

3 Nefness of $h-e$ in the blowup of $\mathbb{P}^n$ 2010-01-29T17:43:18.647

3 Proof of Saito criterion 2010-05-21T10:24:17.223

3 Birational pullbacks of divisors on singular varieties 2010-06-07T20:05:19.220

3 On generators of the Picard group of a projective smooth surface over a finite field 2011-05-29T11:19:58.983

3 Moving a canonical divisor on a normal surface away from the singular locus 2011-07-31T17:33:09.873

3 Generalisations of Riemann-Roch for surfaces 2011-08-08T13:45:27.683

3 Boundedness of $C.K$ on a surface with $-K$ pseudoeffective 2011-09-16T15:14:54.603

3 Is every Weil divisor on an arithmetic surface Q-Cartier 2011-11-11T17:34:59.630

3 When is the Wendt binomial circulant determinant divisible by 3? 2011-12-12T20:40:40.450

3 Roots of line bundles 2012-10-27T18:13:50.107

3 Embedded resolution of singularities 2013-02-01T15:18:19.467

3 Hypersurfaces with Gorenstein singular loci 2013-09-12T21:38:08.923

3 Ample divisors on $\mathbb{P}^3$ blow-up along single point 2014-02-16T02:37:44.257

3 A question about kawamata's proof of vanishing for big and nef $\mathbb{Q}$ divisors 2014-05-26T14:31:55.590

3 A question on klt pairs 2014-09-10T00:22:49.340

3 On Q-Cartier Divisors 2015-03-24T12:36:08.810

3 Question about canonical DM stacks 2015-11-12T22:03:47.807

3 Sections of a linear system splitting as a product of degree one polynomials 2016-04-28T14:25:58.067

3 Psi-classes on moduli spaces of weighted curves 2016-05-24T11:11:36.983

3 Extremal rays of the effective cone 2016-11-17T18:51:22.013

3 Cone of moving curves 2017-01-26T22:26:51.340

3 Lefschetz type theorems for big and nef divisors 2017-03-16T19:47:04.487

3 Rationality of conic bundles 2017-04-04T00:19:18.167