- A criterion for a family to be self-dual.
- Blocking sets and the min-max principle (Thanks to Andrey for the pointer)
- More on greedy and approximation (Addon to Sect. 10.3)
- An application of r-union-free families [PDF], by Ronald de Wolf
- A proof of Sperner's theorem via Hall's theorem [PDF], by Olga Manzhina and Arseniy Sagdeyev
- Sperner's theorem for 2-multisets, by Arseniy Sagdeyev
- A short proof of generalized Sperner's theorem [PDF], by Tomas Juskevicius
- Chernoff's bounds for dependent random variables
- Yet another short proof of Dilworth's theorem
- Kruskal-Katona theorem: Why shifting preserves the neighborhood?
- A story of Bollobás theorem
- A new proof of Isolation Lemma
- An interesting inequality on binomial coefficients

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