Material for the HA course on Wednesday, April 1st

Read: [LS] Sections 1.4 & 1.5

Exercises: 1.4.4, 1.4.11, 1.4.12, 1.4.14, 1.4.19, 1.4.21, 1.4.25, 1.5.3, 1.5.4, 1.5.9, 1.5.11, 1.5.12, 1.5.23 and 1.5.27

[LS] = Homological Algebra (Bernard Le Stum)