Sets equinumerisity.
23442
Cardinality of the union of infinite and countable sets
50906
How to write special set notation by hand?
113053
Zero-based month numbering
115308
Setting default values (conditional assignment)
88375
Is it possible to schedule a task only on working days?
147891
\setcounter{tocdepth}
84700
Give the three numbers that form a geometric sequence.
70278
$A\subseteq B\to C\setminus B\subseteq C\setminus A\,$ -- how to prove this?
155416
How to automatically set time to day with command blocks
119982
how to express the set of natural numbers in ZFC
109189
Periodicity of a triginometric function
54496
Showing that $\mathbb{R}$ and $\mathbb{R}\backslash\mathbb{Q}$ are equinumerous using Cantor-Bernstein
127100
Countable or uncountable set 8 signs
91918
\eqref to give reference to a sequence of subequations
82487
Define a mathematical set
102235
Choosing $n$ equidistant points on a circle with given radius and center
144362
The construction of a Vitali set