Set of functions from $\mathbb{N}$ to $\mathbb{R}$
1396
cardinality of all real sequences
82474
Isometries of $\mathbb{R}^n$
124562
$f:\mathbb{R}^n \to \mathbb{R}$ has expansion $\sum_i g_i(x)x^i$
102972
Cardinality of $\mathbb{R}^\mathbb{R}$ by diagonal argument
14975
Functions satisfying $f:\mathbb{N}\rightarrow\ \mathbb{N}$ and $f(f(n))+f(n+1)=n+2$
109498
Linear maps $f: M_n \longrightarrow \mathbb{R}$ such that $f(AB) = f(BA)$
31710
Show that $\mathcal{J}=\{[a, a+1) \mid a \in \mathbb{R}\}$ generates the Borel set of $\mathbb{R}$
42794
Prove that functions map countable sets to countable sets
44704
familly of Radially open sets in $\mathbb{R}^2$
117793
Finding a function $\mathbb{N} \to \mathbb{N}$ that is surjective but not injective.
75059
Let $T:\mathbb{R}^n\to \mathbb{R}^n$ be a linear transformation...
97878
Are there uncountably many surjections from $\mathbb N$ to $\mathbb N$?
12349
a construction of a continuous function from a normal space to [0,1]
67848
Let $A$ be the set of all functions $f:\mathbb{R}\to\mathbb{R}$ that satisfy the following two properties.
146436
Cardinality of the set of bijective functions on $\mathbb{N}$?
95747
Number of countable subsets of $\mathbb{R}$
58597
A characterization of functions from $\mathbb R^n$ to $\mathbb R^m$ which are continuous