What was the most difficult part of the material for you?
I had a hard time understanding how composition of three functions could be associative. I looked at an example and it made a lot more sense because I realized it doesn't matter which function you "plug in" to the other function first, because the order is the same.
What was the most interesting part of the material for you?
It's interesting to think about when operations on functions make sense and when they don't. For instance, multiplication and addition make good sense on the set of all real numbers, but when we have an arbitrary set of elements we couldn't say that one element multiplied by another is an element of the set.
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