2 10/08

1. New: 7.7.13. Old: 6.7.13 (the same two ways as in class)

2. New: 7.2.6. Old: 6.2.6. (``by 4'', not ``by row 4'')

3. New: Prove theorem 7.10. Old: Prove theorem 6.10.

4. New: 7.3.10. Old: 6.3.10