A series of linear algebra lectures given in videos by Khan Academy.

Rowspace Solution to Ax=b example
Visualizing the rowspace solution to Ax=b

Showing that A-transpose x A is invertible
Showing that (transpose of A)(A) is invertible if A has linearly independent columns

Linear Algebra: Projections onto Subspaces

Linear Alg: Visualizing a projection onto a plane
Visualizing a projection onto a plane. Showing that the old and new definitions of projections aren't that different

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