Difficult: So let me make sure I have this correct, the difference between codomain and range is that the codomain is all possible values of y, while the range is the only ones that get used? What does the symbol that is an o with a vertical slash through it mean? I just think it looks nice, but does it actually mean something specific? Also, if B={1,2}, would it be bad to represent the set of all functions from A to B by 2^A? (Since B is supposed to be {0,1} according to the last line of chapter 9.2)
Interesting: There is definitely a lot of interesting notation/vocabulary used and learned, such as image and mapping. I also thought the evolving definition of the word "function" over time was interesting as well, though the really old ones are really quite abstract and difficult to understand.
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