- A homework is due (section 2.1)
- NO homework due Wednesday; it got moved back because we did some review last time.
- Your homework (for section 1.4) is returned: graded
- 19:
- How many of you considered the possibility that it might not be valid? Almost no one!
- Make the antecedent true by making its antecedent false, and use a false consequent....
- 26:
- Existential before universal....
- Then, when you do the universal, match the arguments, for goodness's sake!
- 28:
- The first two were six lines, using a hypothetical syllogism
- The last two took me nine, using simplifications, etc.
- Once again, watch the mixing of
and
and
and
More of you than not are screwing that up!
- 30:
- In the back of the book....