This is episode 3 of a course on algebraic topology.
We introduce the define the singular chain complex and its homology relative to a subspace.
The absolute singular homology is defined in https://youtu.be/RzyVuVJXxCc .
Previous video: https://youtu.be/RzyVuVJXxCc
Next video: https://youtu.be/-STinyXlx94
Outline:
00:00 Start
06:12 Def.: n-th relative singular chain group
10:07 Def.: n-th relative singular homology