Chapter 1 Section 1.3 in the Epp textbook is the introduction to Relations and Functions; in Levin look at Section 0.4. Again you should find the contents familiar from Year 1. The video recaps all the theory.
To check your understanding try the following exercises in Epp.
- Exercise 1.3 Questions 1, 3, 7, 9, 13, and 15
Or you could instead try the interactive Exercises in Section 0.4 of Levin.