1. I didn't understand the Theorem in 3.1.3 about the ax + by = d equation. I'm confused with the r2 = a(-q2)+b(1+q1q2) part. I can't see how they got that or the next couple of steps. I'm also not sure how the result proves the original proposition.
2. I know it was brief, but I liked how they mentioned the German Enigma. I recently watched The Imitation Game (about the guy who cracked it), which has made me really excited about this class. I liked how the reading helped me remember that.
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