Homology and Cohomology

Original video (full): • Dror Bar Natan: Knot T...
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[@pascalvollmer8333]

This is a general and helpful explanation.

[@KineHjeldnes]

Ah thank you for this clip, very good explanation. And I will watch the whole episode today!

[@mateperic939]

it would be nice if he defined what's image and what's kernel....

[@iwatochmyna9764]

The image (as a set) is the set of all the objects reached by the map, while the kernel is the set of all the objects whose image (as an object) by the map is zero (or the analogue of zero).