Stochastic Finance: An Introduction in Discrete Time - Hans Föllmer, Alexander Schied - Google Books

http://books.google.de/books?id=KhMvmS2qK4QC&pg=PA52&dq=f%C3%B6llmer+schied+numerical+representation+relation&hl=de&sa=X&ei=d6xd

This book is an introduction to financial mathematics. It is intended for graduate students in mathematics and for researchers working in academia and industry. The focus on stochastic models in discrete time has two immediate benefits. First, the…