1.9, due September 21

Difficult: I had a hard time understanding the proof of Fermat's little theorem, specifically how the theorem applies to the negative integers. It would be nice to spend some more time on that in class. Its corollaries would also be good to spend some time on.

Reflective: I found it amazing that you can compute the modulus of a high-powered number so quickly! And the application of that concept to cryptography is pretty cool -- that it is so easy to encrypt and decrypt something given the key, but so hard to without it!

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