The most difficult part of this material for me was understanding the dihedral group of degree n. I don't really what is going on to make this a group. I also, found Theorem 7.4 a bit confusing with the different symbols. I think one of the most difficult things for me is that there are so many different "operations" that could take place that it is confusing to me to figure out exactly what a group is.
The most interesting part of this section for me was also the most difficult. I found it really rather neat how a group it seems is more or less something with a pattern and that pattern/operation can be a bunch of different things. I also gound it interesting that symmetry groups have been used by physicists to predict the existence of certain elementary particles.
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