1. (Difficult) Indexed collection of sets. It is difficult to understand a non-tangible grouping of a group of groups of things. It get's very deep very quickly to try to visualize. Also, it is not referred to again in the text. I almost found partitions equally difficult, but they are discussed in relation to subsets and explanations are given to find subsets of partitions. It provides another view of what partitions are. The Indexed collection of sets are not explained in the same way (two sources of illumination).
2. (Reflective) I find it interesting that there has been no introduction of application of sets. I can imagine that sets and set algebra could be effective ways of ordering and manipulating groupings of data that are related, I'm just not sure what way that would be. The manipulation of sets to get indexes, partitions, Cartesian products, etc... is very straight forward. I expect it will get complicated very quickly.
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