notes
combinatorics
- Kazhdan-Lusztig polynomials for 321-hexagon-avoiding permutations
- How hard is it to organize a white elephant?
- Differential equations and Stirling numbers of the second kind
- An interesting group action on the hyperpsimplex
topology
- A notebook about the choice of lens in the mapper algorithm
- An example illustrating the Siefert-van Kampen theorem
prelims
check out complex analysis preliminary written exam solutions and manifolds and topology preliminary written exam solutions. i am no longer actively updating them, so please make pull requests to keep them up-to-date!