Sum and Intersection of Subspaces Smirnov Sergey Valerievich 00:16 Extending a Basis 15:47 Intersection of Two Subspaces 22:36 Sum of Two Subspaces 33:45 The Relation for Dimensions 48:49 Direct Sum of Two Subspaces 01:17:58 Direct Sum of More Than Two Subspaces 01:43:04 External Direct Sum Teach-in: https://teach-in.ru/course/linear-algebra-smirnov YouTube playlist link: https://www.youtube.com/playlist?list=PLcsjsqLLSfNCCQ_ASlLbvnFzxxc9GuCwn VK playlist link: https://vkvideo.ru/playlist/-176441665_850 RuTube playlist link: https://rutube.ru/plst/1440066