Lower bound for maximal function which yields maximal function is not integrable
104518
Lower bound for the Hardy-Littlewood maximal function implies it is not integrable
2129
Showing that the derivative operator is not bounded on $L^2 (\mathbb{R})$
134575
Show that the mapping $f → f~'$ from $C^1([0 , 1])$ to $C([0 , 1])$ is not continuous.
12639
Example of primitive function which isn't Riemann-integrable on a closed interval [0,1]
20437
Closed surjection that does not preserve regularity
19658
$\max_{t\in[0,T]}|x(t)|^2 \le |x(0)|^2e^{\int_0^T|y|^2\,\mathrm ds}.$ using gronwall's lemma?
51886
Soft version of the maximum function?
112501
A funtion and its fourier transformation cannot both be compactly supported unless f=0
76147
Bounding holomorphic function at 0 given other bounds
21843
Proving a function is not Riemann integrable
102871
$\langle r\rangle$ maximal $\iff r$ irreducible
123806
How do I show that the integral of $e^{inx}$ over a set of measure $1$ is nonzero for some nonzero $n$?
67625
$C([0, 1])$ is not complete with respect to the norm $\lVert f\rVert _1 = \int_0^1 \lvert f (x) \rvert \,dx$
155004
Maximal points on an $n$-dimensional ellipsoid
63516
$C^1[0,1]$ is not complete with respect to sup norm
93923
No surjective bounded linear map from $\ell^2(\mathbf{N})$ to $\ell^1(\mathbf{N})$
107389
Show that the vector space of real functions is not finitely spanned