Set (mathematics)

{disambiguate=mathematics}

= Set
{synonym}

Intuitively: unordered container where all the values are unique, just like C++ `std::set`.

More precisely for set theory <formalization of mathematics>:
* everything is a set, including the elements of sets
* string manipulation wise:
  * `{}` is an empty set. The natural number `0` is defined as `{}` as well.
  * `{{}}` is a set that contains an empty set
  * `{{}, {{}}}` is a set that contains two sets: `{}` and `{{}}`
  * `{{}, {}}` is not well formed, because it contains `{}` twice
