Skip to main content

Stack Exchange

Deane

New York, New York

http://cims.nyu.edu/~yangd/

Professor of Mathematics, New York University

top accounts reputation activity subscriptions
Top Questions
86 votes

Is there a complex structure on the 6-sphere?

dg.differential-geometry complex-geometry open-problem asked Oct 22, 2009 at 23:16
mathoverflow.net

39 votes

Negative impact of wrong or non-rigorous proofs

soft-question ho.history-overview gm.general-mathematics asked Jul 18, 2014 at 14:55
mathoverflow.net

25 votes

Ellipse naturally associated with a polygon

convex-geometry convex-polytopes integral-geometry dg.differential-geometry asked Nov 30, 2010 at 1:41
mathoverflow.net

24 votes

Ring with three binary operations

ra.rings-and-algebras asked Feb 5, 2013 at 16:34
mathoverflow.net

22 votes

Is the metric completion of a Riemannian manifold always a geodesic space?

dg.differential-geometry mg.metric-geometry riemannian-geometry asked Jan 18, 2019 at 18:55
mathoverflow.net

22 votes

Point singularity of a Riemannian manifold with bounded curvature

dg.differential-geometry riemannian-geometry open-problem asked Oct 21, 2009 at 2:41
mathoverflow.net

15 votes

Is a smooth closed surface in Euclidean 3-space rigid?

dg.differential-geometry open-problem asked Oct 22, 2009 at 23:23
mathoverflow.net

15 votes

Does the Legendre-Hadamard condition imply a generalized Gårding inequality?

ap.analysis-of-pdes harmonic-analysis elliptic-pde asked Jan 21, 2015 at 20:20
mathoverflow.net

13 votes

Existence, uniqueness, and regularity for linear parabolic PDE on a complete Riemannian manifold

riemannian-geometry dg.differential-geometry ap.analysis-of-pdes asked Jan 25, 2012 at 23:15
mathoverflow.net

12 votes

Geodesics on a Grassmannian

dg.differential-geometry asked Dec 4, 2009 at 5:37
mathoverflow.net

1 2

Top Answers
197
Why do so many textbooks have so much technical detail and so little enlightenment?
mathoverflow.net

143
Why do we teach calculus students the derivative as a limit?
mathoverflow.net

140
Why study Lie algebras?
mathoverflow.net

98
What's a great christmas present for someone with a PhD in Mathematics?
mathoverflow.net

97
Proofs that require fundamentally new ways of thinking
mathoverflow.net

91
Parodies of abstruse mathematical writing
mathoverflow.net

88
Do good math jokes exist?
mathoverflow.net

63
How has "what every mathematician should know" changed?
mathoverflow.net

62
John Nash's Mathematical Legacy
mathoverflow.net

60
Too old for advanced mathematics?
mathoverflow.net

58
Why is cotangent more canonical than tangent?
mathoverflow.net

58
Examples of simultaneous independent breakthroughs
mathoverflow.net

54
Why is a topology made up of 'open' sets?
mathoverflow.net

53
Are there proofs that you feel you did not "understand" for a long time?
mathoverflow.net

52
Where does a math person go to learn quantum mechanics?
mathoverflow.net

47
Writing papers in pre-LaTeX era?
mathoverflow.net

45
What is the Implicit Function Theorem good for?
mathoverflow.net

43
Reading list for basic differential geometry?
mathoverflow.net

42
Which mathematical definitions should be formalised in Lean?
mathoverflow.net

39
Tenure vs nontenure jobs
academia.stackexchange.com

39
Why are matrices ubiquitous but hypermatrices rare?
mathoverflow.net

38
Physicist's request for intuition on covariant derivatives and Lie derivatives
mathoverflow.net

34
Does Physics need non-analytic smooth functions?
mathoverflow.net

32
Sheaves and bundles in differential geometry
mathoverflow.net

30
Mathematical "urban legends"
mathoverflow.net

30
Geodesics on spheres are great circles
mathoverflow.net

27
Major mathematical advances past age fifty
mathoverflow.net

27
Careers advice for Ph.D.s without current postdocs or university jobs
mathoverflow.net

27
Proofs that require fundamentally new ways of thinking
mathoverflow.net

26
Why do we care about $L^p$ spaces besides $p = 1$, $p = 2$, and $p = \infty$?
mathoverflow.net

1 2 3 4 5 … 9