Solutions of "Introduction to homological algebra" by Charles Weibel

I have some handwritten solutions. I type them up from time to time when I got bored. It may take forever to complete the solution.
  1. Chapter 1, section 1 (PDF)
  2. Chapter 1, section 2 (PDF)
  3. Chapter 8, section 1 (PDF)
  4. Chapter 8, section 2 (PDF)
  5. Chapter 9, section 1 (PDF)