A. The challenging part in this section was the vocabulary at first. Then as I reread it and followed it with the diagram I was able to understand it better. Functions are where a relation A to B has special properties such that in the ordered pair the first coordinate a is not repeated for the different coordinates of b. Put in a and you get a b. b may repeat but not a. Figure 9.1 helped me see how this works.
B. I liked the formula for determining the number of elements in a set A to B. Plug and chug formulas are fun because in this case it is simple and easy to remember.
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