User Dev Sinha

56 votes

understanding Steenrod squares

answered Mar 29, 2010 at 8:41

40 votes

Why does one think to Steenrod squares and powers?

answered Mar 29, 2010 at 8:33

35 votes

How do you approach your child's math education?

answered Apr 1, 2010 at 6:59

33 votes

"Why the heck are the homotopy groups of the sphere so damn complicated?"

answered Apr 27, 2010 at 6:41

24 votes

Intuitive explanation for the Atiyah-Singer index theorem

answered May 13, 2010 at 5:46

22 votes

Accepted

Advantages of working with CW complexes/spaces over Kan complexes/simplicial sets?

answered Jul 13, 2010 at 1:08

19 votes

Modern survey of unstable homotopy groups?

answered Jan 2, 2019 at 19:27

16 votes

How to get product on cohomology using the K(G, n)?

answered Mar 29, 2010 at 7:26

16 votes

References for homotopy colimit

answered Mar 29, 2010 at 9:01

15 votes

How can I visualize the nontrivial element of $\pi_4(S^3)$ and $\pi_5(S^3)$ ?

answered Sep 20, 2010 at 6:09

15 votes

What is the intuition for higher homotopy groups not vanishing?

answered Jul 24, 2019 at 5:00

13 votes

Detailed proof of cup product equivalent to intersection

answered Apr 4, 2010 at 23:53

13 votes

What would be the ramifications of homotopy theory being as easy as homology theory?

answered Apr 21, 2010 at 3:15

12 votes

Construction of the Stiefel-Whitney and Chern Classes

answered Apr 1, 2010 at 5:04

12 votes

Homotopy commutativity of the cup product

answered Mar 29, 2010 at 20:41

12 votes

Why aren't there more classifying spaces in number theory?

answered Aug 31, 2010 at 5:39

11 votes

Understanding iterated integrals

answered Apr 1, 2010 at 7:52

11 votes

Mathematicians with both “very abstract” and “very applied” achievements

answered Jan 7, 2020 at 20:33

10 votes

What is the difference between homology and cohomology?

answered Apr 12, 2010 at 6:22

10 votes

Spectral sequences: opening the black box slowly with an example

answered Nov 11, 2010 at 5:56

9 votes

How should one think about pushforward in cohomology?

answered Jun 11, 2011 at 4:30

9 votes

how do you visualize characteristic class?

answered Nov 10, 2015 at 19:30

8 votes

Accepted

Characteristic classes of symmetric group $S_4$

answered Jul 2, 2019 at 17:25

8 votes

Essential theorems in group (co)homology

answered Mar 30, 2010 at 7:07

7 votes

Is there any analogs of Vassiliev invariants in higher dimensions?

answered Apr 24, 2010 at 4:59

7 votes

Examples of advance via good definitions

answered Mar 7, 2017 at 17:50

7 votes

What would you want to see at the Museum of Mathematics?

answered Dec 31, 2010 at 4:49

7 votes

What would you want to see at the Museum of Mathematics?

answered Dec 31, 2010 at 5:14

7 votes

$\pi_4$ of simply-connected 4-manifold

answered Aug 31, 2010 at 18:29

7 votes

Rational homotopy groups of $S^2\vee S^2$

answered Jun 17, 2021 at 12:31

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45 Answers

understanding Steenrod squares

Why does one think to Steenrod squares and powers?

How do you approach your child's math education?

"Why the heck are the homotopy groups of the sphere so damn complicated?"

Intuitive explanation for the Atiyah-Singer index theorem

Advantages of working with CW complexes/spaces over Kan complexes/simplicial sets?

Modern survey of unstable homotopy groups?

How to get product on cohomology using the K(G, n)?

References for homotopy colimit

How can I visualize the nontrivial element of $\pi_4(S^3)$ and $\pi_5(S^3)$ ?

What is the intuition for higher homotopy groups not vanishing?

Detailed proof of cup product equivalent to intersection

What would be the ramifications of homotopy theory being as easy as homology theory?

Construction of the Stiefel-Whitney and Chern Classes

Homotopy commutativity of the cup product

Why aren't there more classifying spaces in number theory?

Understanding iterated integrals

Mathematicians with both “very abstract” and “very applied” achievements

What is the difference between homology and cohomology?

Spectral sequences: opening the black box slowly with an example

How should one think about pushforward in cohomology?

how do you visualize characteristic class?

Characteristic classes of symmetric group $S_4$

Essential theorems in group (co)homology

Is there any analogs of Vassiliev invariants in higher dimensions?

Examples of advance via good definitions

What would you want to see at the Museum of Mathematics?

What would you want to see at the Museum of Mathematics?

$\pi_4$ of simply-connected 4-manifold

Rational homotopy groups of $S^2\vee S^2$