24 - Intersections and sums of subspaces

25 - Direct sums of subspaces

30. Linear Transformations and Their Matrices

Linear Algebra 2 - 1.5.5 - Basis for an Intersection or a Sum of two Subspaces (Video 2)

Independence, Basis, and Dimension

1.C.3 Sums of subspaces

23 - More examples of subspaces

Sums U+W and direct sums U⊕W of subspaces | definition, criterions, several examples

Oxford Linear Algebra: Direct Sum of Vector Spaces

33 - The dimension of a vector space

Subspaces and Span

Linear subspaces | Vectors and spaces | Linear Algebra | Khan Academy

Proof that any Intersection of Subspaces of a Vector Space V is a Subspace of V | Linear Algebra

1. The Geometry of Linear Equations

Basis and Dimension

10. The Four Fundamental Subspaces

Vector Space

Lecture 4: Sums and direct sums

21 - Vector spaces

22 - Vector subspaces