Naive Set Theory is a book written by Paul Richard Halmos that provides an introduction to the fundamentals of set theory. The book is part of the University Series in Undergraduate Mathematics and is designed to be accessible to students who are new to the subject. The book covers a range of topics, including the basic concepts of sets, relations, functions, and cardinality. It also explores more advanced topics, such as transfinite induction and the axiom of choice. The book is written in a clear and concise style, with numerous examples and exercises to help readers develop their understanding of the material. Overall, Naive Set Theory is an essential resource for anyone studying set theory, whether as part of a mathematics degree or as a self-study guide.This scarce antiquarian book is a facsimile reprint of the old original and may contain some imperfections such as library marks and notations. Because we believe this work is culturally important, we have made it available as part