books by subject
Mathematical Set Theory
Axiomatic Set Theory (Dover Books on Mathematics)
Sets and Groups (Library of Mathematics)
Sets and Groups: A First Course in Algebra, Second Edition
Schaum's Outline of Set Theory and Related Topics
An Introduction to Mathematical Reasoning: Numbers, Sets and Functions
Numbers, Sets and Axioms: The Apparatus of Mathematics
Sets, Logic and Categories (Springer Undergraduate Mathematics Series)
Convex Sets and Their Applications (Dover Books on Mathematics)
Basic Set Theory (Dover Books on Mathematics)
Fuzzy Logic: The Revolutionary Computer Technology that Is Changing Our World
A Concise Introduction to Pure Mathematics, Second Edition (Chapman Hall/crc Mathematics)
Math Hacks
The Ethics of Intensification: Agricultural Development and Cultural Change: 16 (The International Library of Environmental, Agricultural and Food Ethics, 16)
Set Theory: The Third Millennium Edition, revised and expanded (Springer Monographs in Mathematics)