Hank Scorpio
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  • Cypress Creek
0 answers
5 votes
160 views
1 bookmarks
Derivative of dual isogeny is pullback on $H^1$
1 answers
5 votes
134 views
Erroneous reference to EGA I 6.9.17 and Deligne's formula
1 answers
5 votes
126 views
1 bookmarks
What is the projective bundle over $(\Bbb P^1\times\Bbb P^1)/(\Bbb Z/2)$ which isn't $\Bbb P(\mathcal{E})$ for some vector bundle $\mathcal{E}$?
1 answers
4 votes
100 views
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Why can you check closedness on the fibers? (Hartshorne's proof of Bertini's theorem)
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4 votes
105 views
1 bookmarks
Given two points $x,y$ in a separated scheme $X$, is there always some function on an open set containing both that distinguishes them?
2 answers
2 votes
53 views
1 bookmarks
Ramification at infinity for a cyclic cover of $\Bbb P^1$
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2 votes
45 views
No lines meeting a curve in at least three distinct points implies no lines meeting a curve in three points counted with multiplicity?
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2 votes
74 views
General position theorem for curves: do we use characteristic zero in this proof?
1 answers
2 votes
102 views
Map of $R$-modules is surjective iff it's surjective after tensoring with $R_p/pR_p$ for all primes $p\subset R$
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2 votes
99 views
Hartshorne II.7.10: Is there any error in my proof that every Zariski-locally trivial $\Bbb P^n$-bundle is relative Proj of a locally free sheaf?
0 answers
2 votes
62 views
Why are "most" lines through a point in $\Bbb P^n$ not tangent to a given projective variety?
1 answers
2 votes
134 views
1 bookmarks
Why should a transverse intersection give intersection multiplicity one?
1 answers
1 votes
41 views
Canonical map for algebraic curve is nondegenerate
1 answers
1 votes
94 views
Why can a trigonal genus 5 curve be represented as a plane quintic with a node?
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1 votes
48 views
What specifically does a $g_d^r$ on a curve mean in algebraic geometry?
1 answers
1 votes
130 views
Given a degree-two endomorphism of an elliptic curve, how to construct the following map to $\Bbb P^1$?
1 answers
1 votes
82 views
Normalization of a projective curve over a field doesn't add new constant functions
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0 votes
43 views
For a hyperelliptic curve $X$ and a divisor $D$, when is $D$ not linearly equivalent to $ng_2^1+P$?
1 answers
0 votes
53 views
When is $l(D)\neq 0$ for $D$ a degree-zero divisor on an elliptic curve?