A nice way to see that $(\ell^\infty,d_\infty)$ is not separable
95635
$\ell^{\infty}(\mathbb N)$ is not a separable space
146839
Orthogonal Projection onto the $ {L}_{\infty} $ Unit Ball
50160
The quotient norm on $\ell^{\infty}(\mathbb{N}) / c_0 (\mathbb{N})$ is given by $\limsup_{n \in \mathbb{N}} |x_n|$.
108816
$L^p$ integrable but not $L^q$ integrable
143708
$L^1$ and $L^{\infty}$ are not reflexive
153166
Strong and weak convergence in $\ell^1$
58562
How can we prove that $D(f)\backsimeq\operatorname{Spec} A_f$?
5105
Alternative definition of $\|f\|_{\infty}$ as the smallest of all numbers of the form $\sup\{|g(x)| : x \in X \}$, where $f = g$ almost everywhere
39583
ii) Show that $u$ is not a real part of the function which analytic on $\mathbb{C} \backslash \lbrace 0 \rbrace$
13732
$||f||_p\to ||f||_\infty$ under general assumptions
128381
Branches of $\log(z)$ on $\mathbb{C}\backslash(-\infty,0]$?
50946
Separable Hilbert space have a countable orthonormal basis
90826
Constructing a subset not in $\mathcal{B}(\mathbb{R})$ explicitly
58456
Why is $ 1^{\infty} \not= \lim_{t \to \infty} 1^t = 1$?
102914
Integral domain that is not a factorization domain
113790
$\overline{B_1(0)}$ is not weakly* sequentially compact in $(l^\infty)$'
132382
Showing a set is nowhere dense in $C([0,1])$