Is it true that $X \times I \sim Y \times I \Longrightarrow X \sim Y$?
116378
Nonhomeomorphic subsets of the plane
57269
A special bijection between $\mathbb{R}\times \mathbb{R}$ and $\mathbb{R}$
80656
Is it possible to iterate a function transfinite times?
41099
If $A \subseteq C$ and $B \subseteq D$ then $A \times B \subseteq C \times D$
157924
$\forall x\in\mathbb{N}[(\exists y\in\mathbb{N}(2\leq y\land y<x\land y\ |\ x))\to(\exists z\in\mathbb{N}(2\leq z\land z\leq\sqrt x\land z\ |\ x))]$
20383
True or False: there is a space $X$ such that $S^1$ is homeomorphic to $X\times X$
6161
The cartesian product $\mathbb{N} \times \mathbb{N}$ is countable
74207
What is $i$ exponentiated to itself $i$ times?
53443
Does $a_n \sim b_n$ imply $\sum_n a_n \sim \sum_n b_n$ for $a_n, b_n>0$?
155136
$x\in \{\{\{x\}\}\}$ or not?
120094
Prove, that for any A, B, C sets, $A\times (B\setminus C) = (A\times B)\setminus (A\times C)$ is true.
58242
Does $[x]\cdot [y]=[xy]$? Here $[.]$ is the GIF
55787
Is there any matrix $2\times 2$ such that $A\neq I$ but $ A^3=I$?
146243
Does there exist a matrix $\mathbf{A}\in\mathbb{R}^{3\times3}$ such that $\mathbf{A}^{2}=-\mathbf{I}$?
140471
Is $ G \cong G/N \times N$?
57816
$(S^1 \times [0,1])/\sim$ homeomorphic to unit disk $ D^2$
81238
Is $O(2)$ really not isomorphic to $SO(2)\times \{-1,1\}$?