Does there always exist a surjection from $\Bbb R$ to $\omega_1$?
100134
Proving existence of a surjection $2^{\aleph_0} \to \aleph_1$ without AC
121198
$W^{1,1}(\mathbb{R}^n)$ is not compactly embedded in $L^1(\mathbb{R}^n)$?
6023
Surjectivity of Composition of Surjective Functions
93017
Isomorphism between $\Bbb R$ and $\Bbb R(X)$?
127488
If $L:\mathbb{R}^n \rightarrow \mathbb{R}^m$ and $m<n$ linear trans. What does this tell about injectivity and surjectivity?
77735
When $\Bbb Z_n$ is a domain. Counterexample to $ab \equiv 0 \Rightarrow a\equiv 0$ or $b\equiv 0\pmod n$
18334
Equivalence between CH and existence of certain sets in $\mathbb{R}^2$
141114
Question about a bijection between $\mathbb R$ and $\mathbb R \cup \{\infty\}$
43598
Do $\omega^\omega=2^{\aleph_0}=\aleph_1$?
73594
Existence of continuous function $f$ on $\Bbb R$ which vanishes exactly on $A\subset \Bbb R$
148500
Understanding this theorem and how to go about proving it surjectivity?
111689
Surjective, but not injective endomorphism
130381
bijection from $(a,b)$ to $\Bbb R$
115999
Is there always an injective map from a space in its dual space?
93923
No surjective bounded linear map from $\ell^2(\mathbf{N})$ to $\ell^1(\mathbf{N})$
15909
Bijection from $\mathbb R$ to $\mathbb {R^N}$
131037
Is every compact subset of $\Bbb{R}$ the support of some Borel measure?