Day 9, Mat420: Real Analysis

Today:

Announcements:
- I haven't finished grading the resubmissions of your first assignment yet.
- Last time:
  - Finished proof of the theorem 1-10.
  - JT showed how to use exercise #11, section 1-1, to make life easier when doing exercise #12.
Today:
- Final comments regarding metrics, from Section 1-2
- More highlights from Section 1-3, including some counting puzzles from section 1.3: Stories from the Motel Infinity, which illustrate the notion of cardinality.

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