The most difficult part of the reading was understanding what an image is. I eventually realized it is just the value that you get when you plug something into a function. The way the book stated it was not the most clear to me. Example 9.1 was also a little difficult to understand. I thought they were talking about related functions, when they were just giving a list of examples.
The most interesting thing was mapping. I remember hearing mapping a lot especially when doing triple integrals. We would either map a function to a plane, or map it to polar coordinates so that we could do the integral. It wasn't too hard once we got some practice with it.
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