The most difficult part of the reading was understanding that the empty set is a relation because it is a subset of A cross B but it means that not a single element in A is related to B. Class really did clarify this though. Other than that it was difficult to understand the notation for domain and range. I understand what they mean, but the notation looks unfamiliar.
The properties of reflexive, transitive, and symmetry are really important especially in proving things. If I relate it to chemistry, many reactions are reflexive, only some are symmetric if the equilibrium is 50/50, and practically some are transitive where they can take two steps to reach a final product or only one step, but for the most part they are neither symmetric or transitive.
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