1. (difficult) I thought it was frustrating that in this section there was no explicit definition of what it meant to be injective or surjective. I can kind of understand from the examples, but can't be totally sure because of the lack of definition.
2. (reflective) I think it is really cool that we can see the truths and rules of being derivatives and composite functions be proven by the relations and sets that we have used to prove so many things. It just goes to show you how all of these mathematics laws are truths as much as they are anything else.
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