Are $\mathbb{R}^1$ and $\mathbb{R}^2$ the same infinity?
14322
Examples of bijective map from $\mathbb{R}^3\rightarrow \mathbb{R}$
105141
$\mathbb R[x]/\langle x^2+1\rangle\simeq\mathbb C$ and $\mathbb R[x]/\langle x^2+1\rangle$ contains a zero of $x^2+1$
115270
What are the generators of $(\mathbb{R},+)$?
110353
Is $\mathbb{R}^n$ a polyhedron?
32765
$\mathbb{C}\mathbb{P}^1$ is homeomorphic to $S^2$
138911
Is $\mathbb R^2$ a field?
156195
1) Show that $(\Bbb Z[\sqrt2]^*, .)$ is infinite.
2348
Show that the sphere, S, and $\mathbb{R}^2$ is not homeomorphic
93177
in which subset of $R^2$ the series is convergent?
153935
A weaker Axiom of Infinity?
147887
When do we have $ \lim_{n\to\infty}\sum_{k=1}^{n^2}\frac{n^{r-1}}{n^r+k^r}0$?
66272
Is there a common notion of $\mathbb{R}^n$, for non-integer $n$?
6227
Showing diffeomorphism between $S^1 \subset \mathbb{R}^2$ and $\mathbb{RP}^1$
107450
False proof that $ρe^{iθ} = ρ$ and so complex numbers do not exist?
84148
Why is $\mathbb{R}^2$ not a subspace of $\mathbb{R}^3$?
140628
Are $(\Bbb R,+)$ and $(\Bbb Q, +)$ elementary equivalent?
144072
Are the spaces $\mathbb{H}^n$ and $\overline{\mathbb{R}}^n_+$ homeomorphic?