lol funny I'm just first watching this today and it was posted exactly 7 years ago xDthanks for the video, really helpful! I was struggling with this concept for my current linear algebra 2 course since I took the non-specialist version of linear algebra 1 which didn't really test us on proofs at all. I think I have a better understanding of the four fundamental subspaces now! :)####[['video', 'Course_General_Feedback', 'POS'], [' linear algebra', 'Course_General_Feedback', 'POS']]