For your information, I have managed to post the solutions to the class problems from tonight class (see Class Problem 5.1 and Class Problem 6.1), as well as the solutions for the problems that were assigned for Chapter 4.
I would also like to use this opportunity to reiterate the offer that I made this evening concerning providing help outside of class. Since class time is limited, I feel that I cannot afford to devote time in class to tasks such as going over problem sets. Furthermore, you and/or your study group may also have other questions concerning course topics. While any individual student is certainly welcome to place a “one-on-one” call with me concerning such matters, I also welcome conference calls with groups, should the need arise. If your study group has any interest in this option, let me know and I can send your group my conferencing number and access code (as well as schedule an appointment). Think of this option as a form of ad hoc office hours with your professor!