Mathematics and Computer Science: lecture notes, books, surveys.
- Graph theory and algorithms
Spectral Graph Theory and its Applications by D. Spielman
Combinatorics of large sparse graphs by F. Chung
Random walks on directed and undirected graphs by F. Chung
Graph-Theoretic Algorithms by T. Biedl
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Theory of computation
- Discrete mathematics
Lecture Notes on Discrete Mathematics by László Lovász
A Short Course in Discrete Mathematics by Edward A. Bender & S. Gill Williamson
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Numerical analysis, Optimization
Lecture notes on Optimization by Pravin Varaiya
Computational optimization by J. Chen
- Other collections
Lecture notes online: Microeconomics, Mathematics, Macroeconomics, Econometrics, Software Tutorials