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red_trumpet
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16 votes
0 answers
416 views

Can non-reduced fibers appear over a subset of codimension $\geq 2$?

13 votes
1 answer
732 views

J.-P. Serre: Duality of regular differentials on singular curves

9 votes
2 answers
480 views

Divided power algebra is artinian as a module over the polynomial ring

6 votes
1 answer
358 views

About "strict" short exact sequences in quasi-abelian subcategory of a derived category

6 votes
2 answers
443 views

Why is the scheme of isomorphisms of sheaves affine over the base?

6 votes
0 answers
189 views

Reference request: Automorphisms of $\mathbb C\{x,y\}$ which preserve the equation of the cusp, $x^3 - y^2$

4 votes
0 answers
179 views

Can Lagrangian fibrations have multiple fibres in codimension $1$?

4 votes
0 answers
216 views

Why does a deformation modify the complex structure *holomorphically*?

3 votes
1 answer
544 views

Jordan–Hölder sequence for $\mu$-semi stable sheaves

3 votes
1 answer
276 views

Does miracle flatness always fail for a non-regular base?

3 votes
1 answer
177 views

How to determine the type of a divisor on a product of elliptic curves?

2 votes
1 answer
147 views

Irreducible components of a general singular fiber correspond to irreducible components of the hypersurface consisting of singular fibers

2 votes
0 answers
126 views

Describing singular fibers of the lagrangian fibration $\mathcal M^s(0, [C], 1) \to |C|$

2 votes
2 answers
382 views

What is the pull-back of a polarization of abelian schemes over different bases?

1 vote
0 answers
61 views

Some question on defining the space of graph homology for Jacobi diagrams

1 vote
1 answer
122 views

Are horizontal divisors on abelian fibered hyperkähler manifolds proportional in $NS(X)$ up to vertical divisors?

1 vote
0 answers
56 views

Given a proper submersion $f: X \setminus F_0 \to D \setminus 0$ which extends to $X \to D$, are cycles on $X$ which run around $0$ boundaries in $X$?