1. (difficult) The most difficult concept I ran across in this reading is the in depth look at proof by contradiction. On the surface, and in the problems that they gave as examples, it looked fairly easy. But, after the story problem example, I was thoroughly confused. It seems in the story problem as if the proof by contradiction was shaky, and not totally convincing as a proof. I began to wonder if this is often the case with Proof by contradiction?
2. (reflective) I've been looking for a chart like the one that is given in 5.3 to help a person to decide what course to take with their proof. I was actually contemplating making a chart myself, but this will be of use instead.
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