Some two of these will be on Exam 3, 2003

1. Using any result through chapter 5, prove that, in neutral geometry, Euclid's parallel property holds if and only if Wallis' Postulate holds. (One direction is in text -- the other has a hint in the exercises.)
2. Using any result covered so far, do number 2 on page 203.
3. Prove Proposition 4.8 in the text.
4. Prove Proposition 4.9 in the text.