Functors: Definition, Examples, and Special Types
32:25
Universality: Definition and Examples (Bijections, Vector Space Bases, Free Groups)
31:12
Limits & Colimits (via Diagrams, Cones, and Cocones)
16:46
Natural Transformation between Contravariant Hom Functors
30:53
Equalizers
31:41
Stability Properties of Pullbacks
12:35
Natural Transformations: Definition and Properties
42:53
Representable Functors
28:51