Difficult: It was slightly difficult for me to understand what the book meant when it said that a property is preserved by isomorphism. The examples clarified it a little bit for me, but I still have trouble with an arbitrary property that can be preserved through an isomorphism, and which properties those are.
Reflective: It was interesting to learn about isomorphisms. I learned about them in linear algebra, although I don't remember the third property that this book identifies as being one of the properties of an isomorphism that we learned about in linear algebra. Additionally, I remember learning about bijections in math 290, so it's nice to have some background about this subject to rely on.
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