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pi_1
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17 votes
3 answers
1k views

Cohomology of ramified double cover of $\mathbb P^n$ (reference)

12 votes
3 answers
891 views

Difference between rationally connected and $\mathrm{CH}_0\simeq \mathbb Z$

6 votes
2 answers
212 views

Linear systems separating points

6 votes
2 answers
224 views

Two abelian groups, each being direct factor of the other

5 votes
1 answer
296 views

tangent cone and local picture

5 votes
1 answer
869 views

Two ways to look at a double cover of the projective line

5 votes
0 answers
114 views

Degree of unirational parametrization of hypersurfaces

5 votes
1 answer
203 views

Geometric description of Stein factorization in a special case

4 votes
0 answers
129 views

homologically trivial $1$-cycles and surfaces

4 votes
1 answer
119 views

Decide whether there are "linear" relations between quadrics

4 votes
0 answers
119 views

Map between irreducible representations in basis given by Young tableaux

3 votes
0 answers
108 views

Taking the inverse of the total Chern class of a subvariety

3 votes
0 answers
199 views

Degree of the discriminant curve of conic bundle associated to a cubic threefold

3 votes
1 answer
204 views

Transitivity of "being the zero locus of a section of a vector bundle"

3 votes
1 answer
571 views

Universal bundle of grassmannian of planes and projective bundle over grassmannian of lines

2 votes
1 answer
463 views

Universal family of grassmannian as projective bundle over $\mathbb P^n$

2 votes
0 answers
94 views

Class of the locus where two sections are proportional

2 votes
1 answer
108 views

Inclusion of incidence correspondences

2 votes
0 answers
106 views

Existence of a universal $0$-cycle

2 votes
0 answers
107 views

Direct factors of Jacobian

2 votes
1 answer
143 views

Ideal of the union of two zero loci

2 votes
0 answers
121 views

Non-complete intersection of low degree

1 vote
0 answers
79 views

Lines meeting a hypersurface with given orders

1 vote
0 answers
123 views

Computing a tangent cone

1 vote
0 answers
125 views

Independence of $\ell$-adic homological equivalence of $\ell$

1 vote
0 answers
169 views

Reference quest: variety of lines and variety of planes

1 vote
1 answer
218 views

Riemann-Roch for reducible surfaces

1 vote
0 answers
154 views

Hessian of an hypersurface

1 vote
0 answers
121 views

Torsion $0$-cycle as difference of two points

1 vote
0 answers
162 views

Reduction of morphism with connected fiber