Separable but not Lindelöf space
105791
Does separability imply the Lindelöf property?
139874
If $X^\ast $ is separable $\Longrightarrow$ $S_{X^\ast}$ is also separable
7069
On the product of $\mathfrak c$-many separable spaces
91991
How do I prove that two closed sets are separable?
22295
Subspace of a separable space is separable
64840
A Banach space that is not a Hilbert space
87624
If $\mathrm{char}(K)=p$ is prime, $L/K$ is separable if and only if $K(\alpha) =K(\alpha^p)$ for all $\alpha \in L$
102585
Why is $L^{\infty}$ not separable?
67050
Every separable metric space has a countable base
96717
Hahn-Banach Theorem for separable spaces without Zorn's Lemma
275
Two consecutive spaces
63285
Prove that this space is not Banach
104354
What is the relation between normal extension and separable extension?
63538
Impossibility of constructing a continuum-size linearly independent set in $\Bbb R$
65180
A compact Hausdorff space that is not metrizable
64375
Non-Metrizable Topological Spaces
149426
Is there a Hausdorff space $X$ separating points of any Hausdorff space?