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Aug
29
awarded  Popular Question
Aug
16
awarded  Nice Question
Aug
7
answered How to prove: “Every subspace of $V$ invariant under $T$ is also invariant under $T^*$ if and only if $T$ is normal.”?
Jul
2
awarded  Curious
Jun
10
accepted surface area of the graph of a convex function
Jun
10
comment surface area of the graph of a convex function
Of course my definition for "area" is the $n-1$ dimensional Hausdorff measure. I suppose the last part of your answer doesn't restrict itself to 3 dimension. The argument works for any dimension with no modification. Thanks for this viewpoint. I was tempted to ask about the proof when $f$ is not differentiable at all.
Jun
10
asked surface area of the graph of a convex function
May
13
comment Min-Max Principle and Harnack's inequality
Thanks for this very well explained answer.
May
13
accepted Min-Max Principle and Harnack's inequality
May
10
comment Min-Max Principle and Harnack's inequality
@GiuseppeNegro just trying to see if somebody might have an idea. I am not "requiring" people to know or answer. That's the purpose of this website, right? People raise questions and people discuss.
May
10
comment Min-Max Principle and Harnack's inequality
@GiuseppeNegro It was merely a sentence saying that. I can't find it again... sorry. But as for my doubt, there is at least no easy way to prove maximum principle with harnack, right?
May
10
asked Min-Max Principle and Harnack's inequality
May
3
asked Upper semi-continuity of log-concave functions
Apr
17
asked reducibility of an operator
Apr
6
revised proof on Poincare's inequality.
added 2 characters in body
Apr
6
comment proof on Poincare's inequality.
which notation do you need me to explain?
Apr
6
asked proof on Poincare's inequality.
Apr
5
accepted Minimizing sequence that has certain property
Apr
3
asked Minimizing sequence that has certain property
Mar
30
accepted Limiting argument when proving inequality in Sobolev space