Today:
- Announcements:
- Your first assignment is returned today. Some comments
- There is a "key"
- Some things to watch out for:
- If you're not in a union, you're in
none;
if not in an intersection, you're
not in all
-- you might not be in
one!
- Be careful to distinguish "element" from "subset".
- Assuming the theorem that you're in the process of
proving!
- Assuming that the "arbitrary" sets you're dealing
with are denumerable, or even finite. We'll
talk more about these....
- Related to this: we don't have a set with the
index "infinity"
- Forgetting to prove an "iff" proof in both
directions.
- You can fix up your proofs by Friday, for some additional partial
credit. Turn in both the original, and the fixes. If you have
questions about individual problems, ask!
- JT: would you present #12 for Friday? Maybe 10 minutes?
- Current assignment:
- Last time:
- Some proofs of the theorems of section 1.2
- Today:
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