Russell's type theory

Russell's type theory is a logical framework designed to avoid paradoxes in set theory by organizing objects into hierarchical levels or "types." It prevents a set from containing itself or what is too "confusing," ensuring expressions are well-formed. Essentially, objects of one type can only relate to objects of a lower type, avoiding self-reference problems. This structured approach helps clarify the foundations of mathematics by maintaining consistent rules about how sets and objects can interact, contributing to a more rigorous understanding of logical and mathematical systems.