Why does $1^{\infty}$ not exist?
13018
Why is $1^{\infty}$ considered to be an indeterminate form
102585
Why is $L^{\infty}$ not separable?
4946
Non-existence of irrational numbers?
63289
Does $\sum\limits_{x=1}^\infty\sin(x)$ converge?
157203
Let $\{f_k\}_{k=1}^\infty\in L^{loc}_1(\mathbb R^n)$, show $\{f_k^2\}_{k=1}^\infty$ does not converge in $\mathscr{D}^\prime(\mathbb R^n)$
108748
Why there are real numbers with infinite digits, but no such natural numbers (or another reason why real numbers are uncountable)
99675
A closed ball in $l^{\infty}$ is not compact
18882
The limit of infinite product $\prod_{k=1}^{\infty}(1-\frac{1}{2^k})$ is not 0?
143708
$L^1$ and $L^{\infty}$ are not reflexive
156727
A step in the proof of Characterization of $W^{1,\infty}$
110526
Why is $l^\infty$ not separable?
101904
Why does this limit exist $x^{x}$
55577
Why is $\frac{1}{\infty } \approx 0 $ and $ \frac{1}{0} = {\infty}$?
65655
Give examples showing why $0\cdot \infty$, $\infty/\infty$, and $0/0$ are meaningless
7309
Why $\lim\limits_{n\to \infty}\left(1+\frac{1}{n}\right)^n$ doesn't evaluate to 1?
1560
Shouldn't the harmonic series converge?
112910
Is the set of real numbers really uncountably infinite?