I obtained Mathematics BSc from the Chinese University of Hong Kong and Master of Data Science from the University of Hong Kong.
Dummit, Foote - Abstract Algebra (Third Edition)
Morandi - Field and Galois Theory
Cox, Little, Schenck - Toric Varieties
Fulton - Algebraic Curves
Magurn - An Algebraic Introduction to K-Theory
Rosenberg - Algebraic K-Theory and Its Applications
O'Neill - Semi-Riemannian Geometry With Applications to Relativity
Tu - An Introduction to Manifolds (Second Edition)
Tu - Differential Geometry: Connections, Curvature, and Characteristic Classes
Hall - Lie Groups, Lie Algebras, and Representations: An Elementary Introduction (Second Edition)
Knapp - Lie Groups Beyond an Introduction (Second Edition)
Varadarajan - An Introduction to Harmonic Analysis on Semisimple Lie Groups
Björk - Arbitrage Theory in Continuous Time (Third Edition)
Hall - Quantum Theory for Mathematicians
Diamond, Shurman - A First Course in Modular Forms
Marcus - Number Fields (Second Edition)
Neukirch - Algebraic Number Theory
Blackadar - Operator Algebras: Theory of C*-Algebras and von Neumann Algebras
Davidson - C*-Algebras by Example
Murphy - C*-Algebras and Operator Theory
Strătilă, Zsidó - Lectures on von Neumann Algebras
Wilansky - Topology for Analysis
Mathematics@CUHK A mathematics blog maintained by mathematics students and alumni from CUHK
Alain Connes The author of the brilliant book “Noncommutative Geometry”. The book is freely available on the web site.
Lieven Vandenberghe There are several lecture notes for the courses he taught and the book “Convex Optimization” for download
James Milne Many high quality free lecture notes and books on such areas as Algebraic Number Theory, Algebraic Geometry, etc.
K. Conrad’s Expository papers Very interesting and educational expositions to various topics in mathematics
Pete Clark Contains a set of nice lecture notes on commutative algebra
Peter Woit The lecture notes on Lie groups and on quantum mechanics are excellent