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Jul
2
awarded  Curious
Jul
2
awarded  Inquisitive
Jun
12
comment Sobolev spaces and Holder continuity (or, fractional derivatives and singularities)
For the second case : $\sqrt{x}$ is holder continuous with $\alpha = \frac{1}{2}$, but the function is not $H^1$.
Jun
4
answered Question on surjectivity, involving a function and its derivative
Jun
4
awarded  Nice Question
Jun
4
asked Getting a “straight” in dice rolls
May
15
awarded  Notable Question
May
9
comment How large can the internet be?
I'm not sure this is a math question?
May
6
comment Show that $\lim_{n\rightarrow\infty} A ^{n} = B$
What is $D{}{}$?
May
2
comment Prove that a function is locally Lipschitz
I looked at it and I agree with you. It looks like in their supposed proof they forgot the derivative. Perhaps by instead adding and subtracting $\left(\tilde{\psi}(\eta_x + \frac{1}{2}\psi_x^2)\right)_x$ you can remedy it?
May
1
comment number of ways to sit 3 children in 5 available seats?
Who is this math teacher and why can't they figure it out?
Apr
30
answered Pi is the circumference over the radius?
Apr
27
comment Discontinuous function in $W^{1, 1}(\mathbb{R}^{2})$
How about the indicator function of $\mathbb{Q} \times \mathbb{Q}$?
Apr
24
awarded  Popular Question
Apr
23
awarded  Nice Answer
Apr
22
answered Euler's errors?
Apr
22
comment Euler's errors?
Dying. Actually, this is not an error he made, since
Apr
18
revised Please review my proof.
Proof verification
Apr
18
suggested suggested edit on Please review my proof.
Apr
18
comment Finding a reidue at essential singularity $z_0=0$
The residue is the coefficient of the $z^{-1}$ term. If that is $0$, then the residue is $0$.