bio  website  math.poly.edu/~yang 

location  New York, New York  
age  
visits  member for  4 years, 11 months 
seen  9 hours ago  
stats  profile views  11,897 
1d

comment 
Normallike coordinates for weakly differentiable metrics
Sorry. What you want to do is make the angular dependence singular b 
Sep 13 
comment 
Normallike coordinates for weakly differentiable metrics
I suggest trying to see if this is true for simple examples, before trying to prove the general case. For example, $$g_{ij} = (1+x^{2\alpha})\delta_{ij}$$ where $\alpha > n/p$. 
Sep 11 
comment 
Poincare lemma for nonsmooth differentiable forms
Another thing to try are harmonic forms, but this fails, too. 
Sep 11 
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Poincare lemma for nonsmooth differentiable forms
I agree with Jochen. In particular, I see how to use the standard proof of the Poincaré lemma to get exactness if the same $k$ is used for every term in the sequence. But I don't see how to recover another order of differentiation when proving surjectivity of the last map in the 2d exact sequence given in the question. 
Sep 6 
answered  How is the metric tensor related to the Hessian of the first fundamental form? 
Sep 5 
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How is the metric tensor related to the Hessian of the first fundamental form?
What do you mean by the "first fundamental form? Or its Hessian? As far as I know, the term "first fundamental form" is used mainly for a submanifold of Euclidean space and refers to the induced Riemannian metric on the submanifold. 
Sep 3 
awarded  ap.analysisofpdes 
Aug 11 
comment 
Writing papers in preLaTeX era?
Sorry but no way. And it might have been Swiss. 
Aug 1 
awarded  Nice Answer 
Jul 31 
comment 
Why does Neeman avoid tstructures?
I don't really see the point of asking this question here, when you can easily try asking the author via email. 
Jul 22 
awarded  Good Question 
Jul 21 
comment 
Negative impact of wrong or nonrigorous proofs
Come to think of it, I heard not that long ago about an entire field full of what you all are talking about, a field from which any sensible young person would flee, even if they love the subject. Forgive me. I'm getting old and my memory is terrible. 
Jul 20 
awarded  Popular Question 
Jul 20 
comment 
Negative impact of wrong or nonrigorous proofs
user36931, I agree. 
Jul 20 
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Negative impact of wrong or nonrigorous proofs
Let me add that I don't see evidence for the claim that people doing the "cleaning up" receive little credit. If "cleaning up" means filling in routine details, then it's generally acknowledged that the original proof is in fact a rigorous one. If, on the other hand, "cleaning up" requires the introduction of new ideas or techniques, then it appears to me that the people doing this are given a lot of credit and the fact that their work provides rigorous proofs of the "theorems" of a prominent mathematician makes it look only better and not worse. 
Jul 20 
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Negative impact of wrong or nonrigorous proofs
S. Carnahan, that's a good point. I'm willing to entertain rumors about this really happening. 
Jul 20 
revised 
Negative impact of wrong or nonrigorous proofs
edited tags 
Jul 20 
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Negative impact of wrong or nonrigorous proofs
Lee, thanks. I agree. 
Jul 19 
comment 
Negative impact of wrong or nonrigorous proofs
Yemon, can you cite a specific example where you believe this happened? 
Jul 19 
accepted  Point of maximal distance on a nonpositively curved PL surface 