25 - Direct sums of subspaces
35:20
26 - Linear combinations and spans
27:05
24 - Intersections and sums of subspaces
13:15
Sums U+W and direct sums U⊕W of subspaces | definition, criterions, several examples
37:19
48 - Linear maps
21:57
33 - The dimension of a vector space
30:52
Oxford Linear Algebra: Direct Sum of Vector Spaces
39:56
30 - Theorems about linear independence
9:47