Are there discontinuous Ring endomorphisms on real numbers?
30817
Is an automorphism of the field of real numbers the identity map?
84114
Does there exist a surjective homomorphism from $(\mathbb R,+)$ to $(\mathbb Q,+)$ ?
134104
Is there a Cantor-Schroder-Bernstein statement about surjective maps?
66272
Is there a common notion of $\mathbb{R}^n$, for non-integer $n$?
27524
Map from real numbers to real numbers as abelian groups
121685
Is there a bijection of the natural numbers which swaps $\frac{1}{n}$-summable subsets with $\frac{1}{\sqrt{n}}$-summable subsets?
72644
Continuous injective map $f:\mathbb{R}^3 \to \mathbb{R}$?
27757
$\mathbb{R}\to\mathbb{R}$ Diffeomorphism with special property
70543
Does an uncountable discrete subspace of the reals exist?
91736
Explicit homeomorphism between open and closed rational intervals?
45270
Surjective endomorphisms of finitely generated modules are isomorphisms
70576
Elementary proof that $\mathbb{R}^n$ is not homeomorphic to $\mathbb{R}^m$
157597
Homeomorphism between $\mathbb{Q}$ and $\mathbb{Q}(>0)$, and $\mathbb{Q}(\ge 0)$
107148
Does there always exist a continuous/smooth map from $\mathbb{R}^n$ onto a manifold $M^n$?
5893
On the commutative property of multiplication (domain of integers, possibly reals)
100437
Classification of connected subsets of the real line (up to homeomorphism)
85633
Rings of polynomials whose (partial) derivatives vanish are Noetherian?