1. (difficult) The difficult part is wrapping my head around the wording of the proof symbols for sets. It will take a little while to note what is actually being stated by set notation. Also, mixing cartesian products with set algebra is confusing.
2. (reflective) We are finally granted a way to disprove statements with the information in 5.1. It was difficult to just push that option in the back of my mind as we were constantly proving the statements given. Counterexample seems to be the only way something can be disproved, but I have been wrong before about what is available. I might get surprised.
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