DIFFICULT
Does Bijective also mean Inverse? Since in order for a function to have an inverse it has to be bijective. I am not sure what is happening in Section 9.7. I'm having a hard time visualizing what 9.7 is talking about. Things make more sense after lecture anyways to me anyway.
REFLECTIVE
Seeing inverse functions again. Section 9.6 seems pretty straight forward and easy to understand. Chapter 9 seems to be a pretty intuitive chapter, probably because it is familiar material. I kind of understand what a Permutation is although I don't think I've ever seen it before.
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