Dan Petersen

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Name	Dan Petersen
Member for	3 years
Seen	2 hours ago
Website	math.kth.se/~danpete
Location	KTH, Stockholm
Age	27

Ph.D. student in algebraic geometry.

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Examples of great mathematical writing

writing soft-question big-list

dec 15 at 4:14 Rodrigo A. Pérez 1,682●9●21

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57

votes

8

answers

3k

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Why are flat morphisms “flat?”

ag.algebraic-geometry intuition soft-question

oct 4 10 at 5:49 Sándor Kovács 23.8k●2●53●73

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52

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25

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8k

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Are there other nice math books close to the style of Tristan Needham?

books math-communication big-list

feb 11 at 14:20 Alfred Inselberg 1●1

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8

answers

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equivalence of Grothendieck-style versus Cech-style sheaf cohomology

sheaf-theory cohomology ag.algebraic-geometry

mar 15 11 at 7:00 Anton Geraschenko♦♦ 13.7k●3●48●108

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38

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9

answers

7k

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Galois Groups vs. Fundamental Groups

gn.general-topology nt.number-theory fields fundamental-group galois-theory

oct 4 10 at 16:25 Minhyong Kim 7,179●5●30●52

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3

answers

2k

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What exactly is the relation between string theory and conformal field theory?

string-theory conformal-field-theory

oct 13 11 at 1:49 Aaron Bergman 1,443●1●5●15

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3

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2k

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Why do Todd classes appear in Grothendieck-Riemann-Roch formula?

ag.algebraic-geometry vector-bundles

mar 8 11 at 12:20 Julien Grivaux 61●1●1

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35

votes

5

answers

4k

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Why are spectral sequences so ubiquitous?

motivation spectral-sequences kt.k-theory-homology homological-algebra

oct 16 10 at 8:50 Greg Kuperberg 36.3k●2●117●179

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35

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7

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2k

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How would one even begin to try to prove that a simple number-theoretic statement is undecidable?

peano-axioms nt.number-theory lo.logic set-theory

jun 15 10 at 4:59 Pierre-Yves Gaillard 543●2●10●16

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2

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Langlands in dimension 2: the Yoshida conjecture

ag.algebraic-geometry arithmetic-geometry motives automorphic-forms langlands-conjectures

oct 5 10 at 20:58 Olivier 2,703●1●8●19

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31

votes

9

answers

5k

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Irreducibility of polynomials in two variables

polynomials nt.number-theory ac.commutative-algebra

jan 15 at 10:06 Tim Browning 186●1●1

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30

votes

3

answers

2k

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Are there motives which do not, or should not, show up in the cohomology of any Shimura variety?

nt.number-theory automorphic-forms shimura-varieties

sep 22 10 at 9:54 Olivier 2,703●1●8●19

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Flatness in Algebraic Geometry vs. Fibration in Topology

ag.algebraic-geometry at.algebraic-topology flatness fibration

apr 3 10 at 1:41 Emerton 39k●4●120●198

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24

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3

answers

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How to show modularity of an elliptic curve?

nt.number-theory

nov 23 11 at 2:10 Wadim Zudilin 8,684●1●24●59

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23

votes

5

answers

1k

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How to think about CM rings?

ac.commutative-algebra ag.algebraic-geometry

nov 28 09 at 18:56 Gil Kalai 10.7k●6●80●144