1. (difficult) The explanation of the equivalence classes and their operations was super confusing at first, have [2]*[3]=[0] for Z_6, but it definitely makes sense now. The book does a good of job of explaining, especially with its likening the operations to a clock that resets at 12 'o-clock to essentially be a zero hour.
2. (reflective) The idea of being well-defined seems to be of little/no use, or have little application in real life. I would really like to have more application for these things in real life scenarios.
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