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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 number0is 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