Lecture 3   Homotopy equivalence and homotopy extension
Channel: Gabriel Islambouli
Date: 17/01/2021

00:00 - Introduction
3:25 - Homotopy equivalence
8:44 - Deformation retractions
16:55 - Homotopy Extension
37:40 - Consequences of Homotopy Extension
48:48 - Attaching maps only depend on homotopy class