Introduction to Mathematical Finance: Discrete Time Models by Stanley R. Pliska (Author)
Publisher: Blackwell Publishing Limited (June 1, 1997) | ISBN-10: 1557869456 | PDF | 60 Mb | 262 pages
Pliska's book lays out the fundamentals of discrete time models in a clear and concise manner. The book is mostly self contained and well supported with examples that enhance understanding. I read it as a part of my introductory Phd finance course along with Theory of Financial Decision Making by Ingersoll and Foundations for Financial Economics Huang & Litzenberger (not direct competitors) and found Pliska's book to be the most understandable of the three.