 Set theory

When Ciro Santilli says set theory, he basically means. Zermelo-Fraenkel set theory.

Set theory is a branch of mathematical logic that studies sets, which are collections of objects. These objects can be anything: numbers, symbols, points in space, or even other sets. Set theory provides a foundational framework for much of modern mathematics and defines concepts such as union, intersection, and subset. Here are some key concepts in set theory: 1. **Sets and Elements**: A set is usually denoted by curly braces.