The Design of Approximation Algorithms
David P. Williamson & David B. Shmoys
Non-Convex Optimization for Machine Learning
Prateek Jain & Purushottam Kar
Book of Proof
Richard Hammack
Everything You Always Wanted To Know About Mathematics
Brendan W. Sullivan
Computers and Intractability: A Guide to the Theory of NP-completeness
Michael R. Garey & David S. Johnson