Basic Set Theory - Azriel Levy - Google Books

https://books.google.de/books?id=hwrmDAAAQBAJ&pg=PA33&lpg=PA33&dq=%22left-narrow%22+relation&source=bl&ots=3BPFgnh9Zz&sig=RXp7LH

Although this book deals with basic set theory (in general, it stops short of areas where model-theoretic methods are used) on a rather advanced level, it does it at an unhurried pace. This enables the author to pay close attention to interesting and…