# 13. Asymptotics III

- [13.1 Recursion](/cs61b-textbook-spring-2026/13.-asymptotics-iii/13.1-recursion.md): Here we go again...
- [13.2 Binary Search](/cs61b-textbook-spring-2026/13.-asymptotics-iii/13.2-binary-search.md): hi-lo!
- [13.3 Mergesort](/cs61b-textbook-spring-2026/13.-asymptotics-iii/13.3-mergesort.md)
- [13.4 B-trees Big O](/cs61b-textbook-spring-2026/13.-asymptotics-iii/13.4-b-trees-big-o.md): A short digression on asymptotics