The most difficult part of the material was the last example and trying to find the error in the proof. It took me a while to catch why the proof was incorrect because they used the same variable in the definitions of n and m. The other difficult was the need for the contrapositive in proving if and only if. I am still not sure I understand why it is important, but I assume it is needed.
The most interesting part of the reading, I thought was the separating of things into cases. I know in previous math courses we would do this all the time especially for x<1 or x>1. I would love to apply this in other fields and I will certainly look for opportunities.
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