Understanding when an operation is well-defined seems like an interesting topic, because it's interesting how the definitions of addition and multiplication we've used are well-defined. It seems intuitive at first, and the proofs help it to make more sense.
What was the most difficult part of the material for you?
I don't understand why alternative operation definitions would be useful, especially when they aren't well-defined. The example at the end of the chapter seems random and not useful.
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