The matrix representation of a composition of linear transformations is the product of the matrices.

Created almost 9 years ago, updated about 8 hours ago

For $T:U\to V$ and $S:V\to W$, compatible basis representations satisfy $[S\circ T]_{D\leftarrow B}=[S]_{D\leftarrow C}[T]_{C\leftarrow B}$. This follows by applying the two coordinate formulas consecutively. Reversing the factors would represent the reverse composition, when defined.

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