Handouts and solution writeups for competition mathematics. If you find a typo, please contact me.
Intermediate counting on AMC to low-AIME level. Includes complementary counting, PIE, circular permutations, and stars and bars.
Sequences on AMC to AIME level. Includes basic sequences, telescoping and recursions.
Coordinate bashing on AMC to AIME level.
Techniques to solve complicated (mostly nonlinear) systems of equations.
Complex numbers on AIME level. Includes roots of unity and relationships to trigonometry.
Useful techniques of bashing and guessing for the AIME.
My solutions of AMC 12A 2023 after taking the exam, with the help of Ian Baek.
My solutions of AMC 12B 2023 after taking the exam, with the help of Ian Baek.