2. On Thursday 8/31, hand in exercises 6 (proof of Prop. 2.4 and 2.5 only) and 9d (with explanations) from chapter two. For 9d you should use that a great circle is the intersection of the sphere is a plane through its center.

3. On Tuesday 9/15, hand in exercises 2a and 6 from chapter 3.

4. On Tuesday 9/19, hand in chapter 3 problems 24, 27 and 32.