Day 8, Mat385

Last time

Next time

• Announcements
  • The quiz over sections 1.3 and 1.4 is returned.
    • Median: 7
    • The quiz
    • The key
    • Some issues:
      • ei before ui
      • $\mathrm{\exists }$ with $\wedge$
      • $\mathrm{\forall }$ with $\to$

  • It appears to me that many of you may not have the textbook. The textbook was required, it's just that I didn't care which version you used, since there haven't been many serious changes over the years. The idea was that you might get a 6th edition for $8.13, for example.... Or these editions for less than ten bucks.

    But it appears clear to me that many of you are not doing the homework problems (or enough of them), or are not seeing enough examples. My highlights are intended to supplement the readings, not replace them. Our author does a lot of examples, and I only do a few -- I don't have time to cover them all.

  • Quiz this week will be over 2.1 and 2.2.

• Last time:
  • We did a few more problems from 1.4 (illustrating temporary hypothesis)
  • We started section 2.2 (but only got halfway through).
  • Marked up
    • highlights from 1.4
    • a few more things from 2.1
    • highlights from 2.2

• Today:
  • We'll finish off highlights from 2.2: Proof by Induction
  • Then we'll start working on 3.1 (here's my highlight worksheet 3.1)

• #31, section 1.4
• #32, section 1.4
• The Curious History of Venn Diagrams: A look at the curious history of Venn diagrams and how they blend logic with geometry (Scientific American)
  

• Some Fun, Motivating Examples from Propositional and Predicate Calculus