The most interesting part of this section was that at the beginning I couldn't understand what isomorphism meant and how it could even be useful, but then once they compared it to a function it instantly made so much more sense and I was able to get a better grasp of it. I like the definition and how it is another way of defining a function.
The most difficult thing right now is the different properties "preserved by isomorphism", and also how to prove injection and surjection. I can't keep track of which properties hold between fields and what need to hold for isomorphism, etc.
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