Kiran Kedlaya - A is less than B

A<B (A is less than B) Kiran Kedlaya based on notes for the Math Olympiad Program (MOP) Version 1.0, last revised August 2, 1999 c Kiran S. Kedlaya. This is an unfinished manuscript distributed for personal use only. In particular, any publication of all or part of this manuscript without prior consent of the author is strictly prohibited. Please send all comments and corrections to the author at [email protected]. Thank you! Introduction These notes constitute a survey of the theory and p