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ulrich

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Fundamental groups of Calabi-Yau varieties

may 17 11 at 19:01 Jason Starr 1,890●8●14

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Stacks determined by their coarse moduli spaces

apr 12 10 at 19:26 Angelo 19.8k●3●47●75

 

101

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23
Simplest examples of nonisomorphic complex algebraic varieties with isomorphic analytifications
19
Is every algebraic smooth hypersurface of affine space parallelizable?
14
Number of $(-1)$ curves on toric surfaces
14
Can one find the hodge number by counting points over finite fields?
13
Why does the Section Conjecture exclude curves of genus 1?
13
Does isomorphic generic fibre imply isomorphic special fibre for smooth morphisms?
13
Is the group of integer points on a finite-type group scheme over Z finitely presented?
12
normal crossing divisor v.s. strict normal crossing divisor
12
Rational points on smooth compactifications
11
Embedding number fields in fields with class number 1
11
Picard group of $\mathcal{M}_{0,n}$
10
When does a bijective morphism of schemes induce an isomorphism of Hodge structures?
10
Example where you *need* non-DVRs in the valuative criteria
9
Invariant differential forms on commutative group schemes are closed!?
9
Galois groups at closed points from Galois group at generic point?
9
Extending a vector bundle to a torsion free sheaf
9
Genus of smooth varieties with small Chow group
8
Can proper-smooth base change be used to show that varieties cannot be lifted to characteristic zero?
8
Is the direct image of the structure sheaf on X isomorphic to the structure sheaf on Y when X->Y is flat and proper with connected fibers between smooth schemes over an algebraically closed field?
8
Which curves can be found on Abelian varieties ?
8
How would a motivic proof of the Riemann hypothesis over finite fields go?
8
Reference for a theorem of Tate on the endomorphism rings of AVs over finite fields
8
Is every algebraic extension of a field of absolute transcendence degree one a separable extension of a purely inseparable extension?
8
Motivation behind Kac’s notation for affine root systems
7
Brauer group of projective space
7
Obstructions to being a hyperplane section or a fibre of a Lefschetz pencil
7
Picard groups of (fiber) products
6
Does the derived category of coherent sheaves determine the hodge theory?
6
l-adic vs complex Perverse Sheaves
6
Motives from the fundamental group made nilpotent
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