Linear Algebra/Matrix Operations

The prior section shows how matrices represent linear maps. A good strategy, on seeing a new idea, is to explore how it interacts with some already-established ideas. In the first subsection we will ask how the representation of the sum of two maps $$f+g$$ is related to the representations of the two maps, and how the representation of a scalar product $$r\cdot h$$ of a map is related to the representation of that map. In later subsections we will see how to represent map composition and map inverse.