The most difficult material in the reading was that on permutations. I understand the concept that the permutations are simply reordering the numbers, but it still maps to the original domain. Once the book started using matrices though it reminded me of linear algebra.
The most interesting part was how the book worded inverses. I remember seeing these functions but we would always set them up as matrices in order to find the inverse. I do not remember exactly how we found the inverse that way. I do remember in high school just switching y and x and that seemed to always work.
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