Is $(\mathbb{Q}, +)$ elementarily equivalent with $(\mathbb{R}, +)$?
140628
Are $(\Bbb R,+)$ and $(\Bbb Q, +)$ elementary equivalent?
12825
Bijection between $2^{\mathbb R}$ and $\mathbb{ R ^ R}$
115976
$\mathbf{Q}[\sqrt 5+\sqrt[3] 2]=\mathbf{Q}[\sqrt 5,\sqrt[3] 2]$?
32760
Is $\mathbf{Q}(\sqrt{2}, \sqrt{3}) = \mathbf{Q}(\sqrt{2}+\sqrt{3})$?
38549
$\mathbb{Q}(\sqrt{n}) \cong \mathbb{Q}(\sqrt{m})$ iff $n=m$
67374
Is it true that $\mathbb{R}$ and $\mathbb{R}^2$ are isomorphic as abelian groups?
76900
$\Bbb Q$-linear is equivalent to additive
53432
What is the algebraic closure of $\mathbb F_q$?
22890
Is it coherent to extend $\mathbb{R}$ with a reciprocal of $0$?
118154
$f: \mathbb{R} \to \mathbb{R}$ that takes each value in $\mathbb{R}$ twice
69166
Cardinality of $\mathbb{R}$ and $\mathbb{R}^2$
141799
Is $2^{|\mathbb{N}|} = |\mathbb{R}|$?
62755
The simplest way of proving that $|\mathcal{P}(\mathbb{N})| = |\mathbb{R}| = c$
84189
Is $\mathbb{C}$ equal to $\mathbb{R}^2$?
48419
Difference between $\mathbb{R}$-linear and $\mathbb{C}$-linear maps
138653
Is $\mathbb{R}$ a subspace of $\mathbb{R}^2$?
157597
Homeomorphism between $\mathbb{Q}$ and $\mathbb{Q}(>0)$, and $\mathbb{Q}(\ge 0)$