18b Commentary on the columnspace of a matrix.
18c More commentary on a spanning set -- On ordering.
18a Proof of the algorithm of removing redundant vectors.
16a Proof of the structural theorem of solutions to nonhomogeneous systems.
16 Solution sets of a linear system $A\vec x = \vec b$.
17 When are two spans the same ?
15 Span of a set of vectors.
14 Linear combinations.
12a Application of matrix-vector product to matrix properties.
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