Set of unordered $n$-tuples of points of $\mathbb{CP}^1$ can be identified with $\mathbb{CP}^n$?
30178
Homeomorphism $(\mathbb{CP}^1)^m/S_m \overset{\sim}{\to} \mathbb{CP}^m$?
30021
Bijection between set of all binary sequences and power set of $\mathbb N$.
70543
Does an uncountable discrete subspace of the reals exist?
145752
Aut $\mathbb Z_p\simeq \mathbb Z_{p-1}$
89167
Cardinality of equivalence relations in $\mathbb{N}$
108691
Characterize the natural numbers $n$ such that there is a surjective group homomorphism from $S_n$ to $S_{n-1}$.
67926
$S_n$ is generated by elements of the form $(1k)$
1627
Cartesian product of an arbitrary number of sets
104016
Limit point of the set $G= \{1/n: n \in \mathbb N\}$?
53261
Show that Pn is an (n+1)-dimensional subspace
132537
Class of sets of a given infinite cardinality
105594
Fixed point, union of $\aleph_0, \aleph_{\aleph_0},\aleph_{\aleph_{\aleph_0}}\dots$ [see Noah's comment on notation]
113668
Uncountable chain of subsets of $\mathbb N$
60424
Uncountable family of uncountable compact subsets of $\mathbb{R}$
28934
Presentation of SL$(n,\mathbb{Z}_p)$
151719
Connected set in $\mathbb{S}^1$
18343
Counting homomorphisms between $\Bbb Z$ and $\Bbb Z_n$ and also between $\Bbb Z_n$ and $\Bbb Q$