Naive Set Theory is a

mathematics textbook by

Paul Halmos originally published in 1960. This book is an undergraduate introduction to not-very-naive

set theory
which has lasted for decades. It is still considered by many to be the
best introduction to set theory for beginners. While the title states
that it is naive, which is usually taken to mean without

axioms, the book does introduce all the axioms of

Zermelo-Fraenkel set theory and gives correct and rigorous definitions for basic objects. Where it differs from a "true"

axiomatic set theory
book is its character: There are no long-winded discussions of
axiomatic minutiae, and there is next to nothing about advanced topics
like

large cardinals. Instead, it tries to be intelligible to someone who has never thought about set theory before.

Description taken from Wikipedia: Naive Set Theory (book). (2007, April 2). In

Wikipedia, The Free Encyclopedia. Retrieved 22:51, November 13, 2007, from

http://en.wikipedia.org/w/index.php?title=Naive_Set_Theory_%28book%29&oldid=119781481
Readership: Researchers and students in mathematics, computer science, logic, philosophy.