Is $1=0.\overline{9}$?
286
Is it true that $0.999999999\ldots=1$?
80060
Is $\frac{1}{\infty}$  equal zero?
67588
Why does $|e^{ix}|^2 = 1$?
31244
Is this a correct bijection between $(0,1]$ and $[0,1]$?
119651
Expressing $1.24\overline{123}=1.24\;123\;123\;123\;\ldots$ as the ratio of two integers
97890
$\{1,1\}=\{1\}$, origin of this convention
24582
Is the set of sequences of natural numbers with trailing zeros countable?
81822
How many integers between $1$ and $10^4$ contain exactly one $8$ and one $9$?
36537
do { ... } while (0) — what is it good for?
19424
Showing $(M^\perp)^\perp=\overline{M}$
10458
How to define a bijection between $(0,1)$ and $(0,1]$?
83638
Suppose $0,0,1,0,0,1,0,0,1,...$ is a sequence. What is the general term of this sequence?
115145
Show that $n-m$ is a multiple of 9 when $n$ and $m$ have same digits
103545
Prove "casting out nines" of an integer is equivalent to that integer modulo 9
117039
How to show $(1/n!)^{1/n}$ goes to $0$ as $n$ goes to infinity?
82775
if $a>1$, Prove that $\lim a^{1\over n}=1$
107842
Behaviour of ($\overline{a}_n)_{n=1}^{\infty}$ and ($\underline{a}_n)_{n=1}^{\infty}$