The most difficult part of the material was understanding why the cardinality of A had to be bigger than the cardinality of B for a function to be one to one from A to B. After re-reading the section it became obvious that if B was less than A, then there would have to be repeating values and it would no longer be one to one.
The most interesting part of the material was simply the identity function expressed that way. I am so used to seeing it as x=x or something similar. I cannot wait to use this function in proofs, but it seems almost trivial.
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