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Dec
26
awarded  Popular Question
Nov
12
awarded  Notable Question
Mar
16
awarded  Yearling
Nov
3
awarded  Popular Question
Jul
11
awarded  Nice Question
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awarded  Curious
Jul
2
awarded  Inquisitive
Mar
16
awarded  Yearling
Mar
16
awarded  Yearling
Feb
3
asked What are the easiest surfaces of general type
Feb
3
comment An example of decomposing a projective variety
Have you tried showing your variety is irreducible? You could use the "dictionary" between closed subsets of projective $n$-space and ideals of k[a_0,\ldots,a_n]$. Being irreducible as a closed subset usually boils down to the polynomials being irreducible.
Feb
3
suggested rejected edit on Definition of tamely ramified
Feb
2
comment Is the number of automorphisms of a hyperelliptic curve bounded
The curve $y^2=x^{2g+1}+1$ admits the automorphism $(x,y)\mapsto (\zeta_{2g+1}^n x, y)$ for all $n=1,\ldots,2g+1$. Thus, the number of automorphisms of this hyperelliptic curve is at least $2g+1$. Is this correct?
Jan
31
asked Is the number of automorphisms of a hyperelliptic curve bounded
Jan
31
accepted Elliptic curves over Spec Z
Jan
30
revised Elliptic curves over Spec Z
added 77 characters in body
Jan
30
asked What do we know about smooth families over the open unit disc
Jan
29
comment Elliptic curves over Spec Z
I wanted to be sure myself, but let $E$ be an elliptic curve over $\mathbf Q$ with good reduction over $\mathbf Z$. Then its minimal regular model coincides with its minimal Weierstrass model.
Jan
29
asked Elliptic curves over Spec Z
Jan
25
revised Doesn't Abhyankar's lemma contradict faithful flat descent (no, but I'm confused)
added 63 characters in body