Zig Zag LemmaCovers the Zig Zag Lemma and the long exact sequence of relative homology.
Natural TransformationsExplores natural transformations between functors, emphasizing their composition-preserving properties and significance in category theory.
Divisibility and TorsionExplores divisibility and torsion in group theory, focusing on defining a functor that preserves divisibility.
Categories and FunctorsCovers categories, functors, and presheaf categories, exploring the relationships between objects and morphisms.