Naive Set Theory - (Dover Books on Mathematics) by Paul R Halmos (Paperback)

This book by a renowned mathematician offers an engaging introduction to set theory, employing informal mathematics language and notation.

Suitable for advanced undergraduates and graduate students in mathematics, it covers basic concepts, cardinal numbers, transfinite methods, and more in 25 brief chapters.

With only a few exercises designated as such, the book is an ongoing series of exercises with hints, making it both broadly useful and challenging.

Whether you're a beginner or professional mathematician looking to refresh your knowledge, this book provides a comprehensive introduction to set theory's foundational concepts.