Mathematical Thinking: Problem-Solving and Proofs 2nd Edition
John P. D'Angelo & Douglas Brent West
The Design of Approximation Algorithms
David P. Williamson & David B. Shmoys
Advanced Engineering Electromagnetics
Constantine A. Balanis
Everything You Always Wanted To Know About Mathematics
Brendan W. Sullivan
Reading, Writing, and Proving: A Closer Look at Mathematics
Ulrich Daepp & Pamela Gorkin
Proofs: A Long-Form Mathematics Textbook
Jay Cummings
Proof and the Art of Mathematics: Examples and Extensions
Joel David Hamkins
Proofs and Refutations: The Logic of Mathematical Discovery
Imre Lakatos