What do we mean when we say that $x \in \mathbb R$
40232
What do we mean when we say "Let $x$ be an element of the set $\mathbb{R}$"?
90540
What is wrong in this proof: That $\mathbb{R}$ has measure zero
44144
If $f:[a,b]\to \mathbb R$ is continuous then so is $\max_{t\in [a,x]}f(t)$?
49240
$\forall x,y \in \mathbb{R}:\vert\cos x- \cos y\vert\leq\vert x-y\vert$
57037
How does $(a,b)$ where $a,b\in \mathbb{Q}$ form a basis for $\mathbb{R}$?
50344
What is the closure of an open ball $B_X(\mathbf{a},r)$ in $X=\mathbb{R}^n$?
106625
Strength of the statement "$\mathbb R$ has a Hamel basis over $\mathbb Q$"
67394
How to interpret $\mathbb{P}(B|A)$ when $\mathbb{P}(A) = 0$
73927
Is $\mathbb{R}$ a subset of $\mathbb{R}^2$?
77957
How is $\mathbb N$ actually defined?
86472
$f:\mathbb R \to \mathbb R^n$ be such that $G(f):=\{(x,f(x)):x \in \mathbb R\}$ is closed and connected in $\mathbb R^{n+1}$ , is $f$ continuous ?
93017
Isomorphism between $\Bbb R$ and $\Bbb R(X)$?
132470
Does $\mathbb R^2$ contain more numbers than $\mathbb R^1$?
44685
Inner product on $C(\mathbb R)$
18330
Does $R[x] \cong S[x]$ imply $R \cong S$?
141858
$\forall \vec{b} \in \mathbb{R}^n, B \vec{x} = \vec{b}$ is consistent is equivalent to....
69166
Cardinality of $\mathbb{R}$ and $\mathbb{R}^2$