The proof of De Morgan's law for any finite number of sets seemed difficult. I saw how the proof was done towards the end and it makes sense but the beginning was unclear to me. I will need to do more practice with these as I prepare for the test.
I an see that induction is useful as it allows us to now prove results for any well-ordered set. To be able to induce that something is true over such a large domain is rather exciting.
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