1.2 The Well-Ordering Principle 3. t (~)xn-khk-l.

k=l 4. See Exercise 5 in Section 1.1.

5. Observe that x2 - x - 2 < 0 for all 0 < x < 2.

6.

(b) First prove that 2n + 1 < 2n for n = 3,4, ....