- Series: Graduate Texts in Mathematics (Book 113)
- Paperback: 470 pages
- Publisher: Springer; 2nd edition (August 25, 1991)
- Language: English
- ISBN-10: 0387976558
- ISBN-13: 978-0387976556
- Product Dimensions: 6.1 x 1.1 x 9.2 inches
- Shipping Weight: 1.9 pounds (View shipping rates and policies)
- Average Customer Review: 4.1 out of 5 stars See all reviews (11 customer reviews)
- Amazon Best Sellers Rank: #749,637 in Books (See Top 100 in Books)
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Brownian Motion and Stochastic Calculus (Graduate Texts in Mathematics) (Volume 113) 2nd Edition
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Brownian Motion and Stochastic Calculus
"A valuable book for every graduate student studying stochastic process, and for those who are interested in pure and applied probability. The authors have done a good job."―MATHEMATICAL REVIEWS
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Top Customer Reviews
As a study copy it should suffice -- the inner margins are a bit tight, but nowhere near as bad as some PoD knockoffs. It just would have been nice to know what I was paying for.
However, there are several important pre-requisites: the reader must be intimately familiar with measure theory, probability theory and stochastic processes. For those new to stochastic calculus it is generally recommended to read Oksendal's book on stochastic differential equations and then come back to Karatzas and Shreve.
Please be warned that even with reasonable background to probability theory and stochastic calculus, this text is very difficult to understand mathematically- it requires a certain level of dedication from the reader if the book is to be read back to back rather than act as a reference
Even to the prepared reader, this book is exasperating. It is as if the authors came up with an excellent outline for an advanced treatment of this topic. Then they realized that to do all of the material justice, they'd need to have not one, but two 400 page volumes. Their publisher must have balked at that idea, so their solution was to leave out half the detail, forcing each of our poor readers to re-generate the missing 400 pages of needed detail on his/her own. In the opinion of this reviewer, that is exactly what they have done with this text.
Fortunately for us all, there exists a nice two volume (800 page total pages) treatment of this material. Rogers & Williams Diffusions, Markov Processes, and Martingales: Volume 1, Foundations and Diffusions, Markov Processes and Martingales: Volume 2, Itô Calculus provide a thorough, accessible exposition with all the needed rigor, generality and detail.
Karatzas & Shreve's treatment of early foundational material is less than helpful to the student. Consider a pair of key results on martingales early on in the text: the optional sampling theorem and the optional stopping theorem. The authors "prove" the optional sampling theorem by appealing to the discrete time results in Chung's A Course in Probability Theory and then applying limiting arguments to bootstrap to the continuous time case. Since all of the real "ideas" are in the discrete time case, it's not clear how much of a service the authors' treatment really is. Worse yet, the optional stopping theorem isn't even called out as a theorem, but instead buried as problem.
It is curious to see which topics inspire the authors to spill ink. For example in Chapter 2, we get not one, but 3, yes three different constructions of Brownian motion: convolved heat kernels, Haar interpolation and random walks/Wiener measure. Of course, only the last construction is used going forward and the first two constructions are not brimming over with detail. This is a curious indulgence in a text that is purposefully being stingy with detail. Our poor reader has to pay the price for this indulgence with an extremely terse treatment of the strong Markov property and reflection principle, the Blumenthal Zero-One Law, and other foundational properties of Brownian motion.
Chapter 3 represents the core of the text and develops all the of "greatest hits" including the Ito Integral, Ito's rule, Levy's characterization of Brownian motion, the martingale representation theorem, the Girsanov Theorem and an introduction of Brownian local time. (Brownian local time is further developed in Chapter 6). The development of the Ito Integral is shamelessly sketchy. All the theorems are correctly stated, but the "proofs" offered aren't detailed enough to explain why all of the stated assumptions are needed. When the reader gets to the development of Ito's rule, he/she finds a rude 3 sentence introduction to semi-martingales, a topic which hadn't been explored and never gets more than a passing mention in the authors' text.
Assuming that you've understood everything going on in the text up to this point, Chapter 4 is quite nice. It gives a very intuitive introduction in the role of the Mean Value Theorem as a hook connecting stochastic integrals with classical PDE's. The section on Harmonic functions and the Dirichlet problem is quite nice. The material on the heat equation requires properties of Brownian motion most easily derived from the convolved heat kernels construction. The chapter winds up with a nice treatment of the Feynman-Kac formulas.
After the PDE's material, the reader might develop a sense of hope that the remainder of the exposition will be readily accessible. This is not the case and with the SDE's in Chapter 5, the authors return to their now too familiar terse style as they study strong and weak solutions to stochastic differential equations. At one point, the authors decide to approach the problem by generalizing from functions to functionals without even so much as defining their notion of a functional.
Really, the only good role for this text is as base material for a do-it-yourself "Moore Method" class on stochastic calculus, like they used to do for general topology at the University of Texas. If you completed a Moore-style class this way and wrote up all of your work, you'd have a very fine text covering diffusions, Markov processes, and martingales.
2 corners of the book were damaged, and the only reasons i didn't try to give it back were because: 1. it's not that big of a problem and 2. it wasnt severely damaged.
but i will seriously consider these types of problems next time i order another book.
While this is a great book, I do have a couple complaints. First of all there a points in the book where overly complicated notation can obscure the point being made. Secondly, since the book does not cover semimartingale integration, topics like the quadratic variation process (which are still important for things like representing a martingale as a time-changed BM) are spread throughout the book and can be difficult to find.
I recommend reading Rogers&Williams "Diffusions, Makov Processes, and Martingales" Vols I&II in addition to this book. Not only does it give a second (and sometimes easier) point of view on the somewhat difficult topic of stochastic analysis, but also covers some topics in greater generality including integration wrt a general semimartingale.
Finally, a warning to those who have interest but are not proper mathematics students. This book presupposes a fair amount of mathematical maturity - if you don't have a good understanding of real analysis and measure-theoretic probability you probably won't understand anything.