Dan Petersen

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Name Dan Petersen
Member for 3 years
Seen 10 mins ago
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Location KTH, Stockholm
Age 27
Ph.D. student in algebraic geometry.
33

Questions
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Is $M_g$ finitely covered by a scheme over the integers?

jun 12 at 22:50 Agol 23.9k●1●33●84

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Why do H_4 and M_4 have the same virtual Euler characteristic?

jun 4 11 at 18:31 Dan Petersen 10.1k●1●21●46

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Is the Grothendieck ring of varieties reduced?

sep 28 10 at 2:20 Chandan Singh Dalawat 11.5k●1●39●73

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What’s up with Wick’s theorem?

nov 25 10 at 23:18 Theo Johnson-Freyd 22.3k●2●27●110

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540
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What is a self-dual category?

mar 28 12 at 9:04 Dan Petersen 10.1k●1●21●46

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What do dessins tell us about the absolute Galois group?

jan 26 11 at 15:44 Dan Petersen 10.1k●1●21●46

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109

Answers
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52
Examples where it’s useful to know that a mathematical object belongs to some family of objects
48
Can the fundamental group of any manifold be realized as the fund grp of a finite space?
28
Is the moduli space of curves defined over the field with one element?
26
Most memorable titles
26
Can we have A={A} ?
24
What does the term “yoga” mean in mathematics?
19
Automorphism group of a scheme
18
Pseudonyms of famous mathematicians
17
Ring-theoretic characterization of open affines?
17
“Surprising” categorical equivalences
15
Never appeared forthcoming papers
15
Teichmuller modular forms and number theory
15
How should one understand orbifold fundamental groups?
14
Ring with three binary operations
14
Applications of Grothendieck-Riemann-Roch?
14
how does one understand GRR? (Grothendieck Riemann Roch)
12
Symmetric polynoms are Hopf algebra ? What for one needs co-product ?
12
Is it written anywhere that open subvarieties of affine spaces have “completely impure” cohomology?
12
Are all parametrizations via polynomials algebraic varieties?
12
Why does the group law commute with morphisms of elliptic curves?
11
Is the Euler characteristic a birational invariant
9
Count of full, binary trees with fixed number of leaves
9
German mathematical terms like “Nullstellensatz”
9
In what sense is the étale topology equivalent to the Euclidean topology?
9
Primitive Cohomology Useful?
9
Line bundle on $S^2$
8
Does smooth and proper over $\mathbb Z$ imply rational?
8
Is there a “motivic Gromov-Witten invariant”?
8
mnev’s universality corollaries, quantitative versions?
8
Counting isomorphism classes of elliptic curves with specific torsion
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