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Qing Liu's user avatar
Qing Liu's user avatar
Qing Liu
  • Member for 14 years, 3 months
  • Last seen more than 8 years ago
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122 Answers

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6 votes
Accepted

What kind of subset is Spec(R_P) in Spec(R)?

6 votes
Accepted

Extending maps of curves

6 votes
Accepted

Concerning the dimension of a complex variety modulo a prime

6 votes

When does a projective morphism give an etale morphism (into affine space)? (Finite field) (normalization)

6 votes
Accepted

Diameter of reduction graph of a curve over a complete discrete valuation ring

6 votes
Accepted

Model of a scheme regular over the generic point

6 votes

Does Zariski's Main Theorem come with a canonical factorization?

6 votes
Accepted

dual isogeny for abelian varieties over a general field

6 votes

Definability over subfields of rational maps to projective space: Cremona transformations, degree, divisors

6 votes

The irreducibility of an algebraic variety

6 votes
Accepted

Prime avoidance in adjacent degrees

6 votes
Accepted

Composition and intersection of residue fields

6 votes

Non-dominant polynomial maps in the plane

5 votes
Accepted

Can the simplicity of abelian varieities be implied by the reduction

5 votes
Accepted

A question arising from the Krull intersection theorem.

5 votes

Is there a Whitney theorem type theorem for projective schemes?

5 votes

Flatness over non-reduced schemes

5 votes
Accepted

When is the restriction map on global sections an embedding

5 votes

products and smooth/étale/unramified morphisms

5 votes

When does a quasicoherent sheaf vanish?

5 votes

Writing down minimal Weierstrass equations

5 votes

Torsion of an abelian variety under reduction.

5 votes

Proving if fibres are reduced or not.

5 votes
Accepted

About the Definition of Flat Morphism (Flat Sheaf)

5 votes
Accepted

(non-trivial) isotrivial family of elliptic curves over C^{\times}

5 votes
Accepted

geometrical reducedness of the identity connected component (reference request)

5 votes

Proper morphisms

4 votes

Is a union of local complete intersections, a local complete intersection?

4 votes
Accepted

Irreducible "family" of relative effective divisors of a smooth morphism

4 votes
Accepted

Projectivity in flat families