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Algebraic varieties, stacks, sheaves, schemes, moduli spaces, complex geometry, quantum cohomology.

1 vote
1 answer
209 views

flatness of a kernel

Hi, let $A$ an abelian scheme over a curve $C$ and $n$ an integer greather than 3 coprime with the characteristic of the ground field. Do you know why the kernel of the multiplication by $n$ is flat o …
2 votes
1 answer
500 views

normalization of a stack

Hi, how is it defined the normalization of an algebraic stack $A$ inside another algebraic stack $B$. If you do not want to write the answer could you give to me some reference? Thank you