Due at the beginning of class, September 18.

Exercises 1.4.2, 1.5.4, 1.5.5, 1.9.26, 1.9.31, 1.9.38, 1.9.39, 1.9.44, 1.9.68

I will select some problems from those to grade. Please ask me about any questions you have on the problems that are not graded.