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Jan 24 
awarded  Popular Question 
Jul 15 
awarded  Nice Answer 
May 24 
awarded  Good Question 
Mar 30 
comment 
What's a mathematician to do?
Probably my favourite answer on MO. 
Mar 21 
answered  Applications of Rademacher's Theorem 
Mar 11 
comment 
What goes wrong for the Sobolev embeddings at $k=n/p$?
I'm not sure I quite appreciate exactly what is being asked. You lay out two cases and then say that what is essentially just a third case is an example of the other two not working. You say that the Sobolev embedding theorem "fails" or "goes wrong" when $k=n/p$, but one might say that it is simply neither of the two cases you lay out at the start. Nothing "fails", it just happens to be its own special case. 
Feb 27 
awarded  Yearling 
Jan 30 
awarded  Nice Answer 
Jan 25 
comment 
What is the “real osculating space” of a (minimal) immersion?
Sorry  so do you know how the osculating space is then defined using this polynomial map? 
Nov 30 
accepted  Divergence form Elliptic PDE Removable Singularity/Regularity Question 
Nov 28 
asked  What is the “real osculating space” of a (minimal) immersion? 
Nov 28 
revised 
Divergence form Elliptic PDE Removable Singularity/Regularity Question
added 456 characters in body 
Nov 26 
asked  Divergence form Elliptic PDE Removable Singularity/Regularity Question 
Nov 3 
awarded  Favorite Question 
Jun 12 
awarded  Notable Question 
May 29 
comment 
Advanced HighSchooler Seeking Career Advice
Aaah! Please don't spread the myth that things like top scores in Putman, Olympiad etc. are some sort of necessity for research at a high level! The infamous `many a website' is a notoriously unreliable source. 
May 13 
comment 
Moser regularity proof avoiding JohnNirenberg lemma
To clarify, the rest of Tilli's paper  i.e. the nonsonew stuff  looks, at a glance, to be the same as the old argument that's in Han and Lin. So it seems a perfectly good source. 
May 13 
comment 
Moser regularity proof avoiding JohnNirenberg lemma
The new point about this paper Mircea seems to be that they avoid the iteration altogether, by basically differentiating' the quantity which is usually treated discretely and iterated. A proof along the lines which Connor describes in his initial answer, i.e. for pure divergence form equations, using iteration but not JohnNirenberg existed right at the start' as it were  it is due essentially to De Giorgi himself. You can find it the book of Han and Lin, Elliptic PDE. The JohnNirenberg Lemma was used by Moser to prove his Harnack inequality, which itself was not crucial for regularity.

May 1 
comment 
Geometric Mean Value Property
Did you find what you wanted? 
Apr 22 
awarded  Scholar 