# Lecture 5 

This lecture covers the preliminaries of homology, namely chain groups and the boundary map. 

- **Reading:** Dey-Wang Ch 2.4 
- **Slides:** 
  - [Lecture 5 slides pdf](CompTop-Lec5-HomologyPt1.pdf)
  - [Transcript of slides](./CompTop-Lec5-HomologyPt1.md)
- **Annotated slides (Fall 2025):** [Lecture 5 slides - Annotated](../Annotated-Fall2025/CompTop-Lec5-HomologyPt1.pdf)