- Do exercise 1.13, p. 18.
- Do exercise 1.5, p. 13.
- Exercise 1.x1: Write a procedure equivalent to the following, but using only a
single
`if`

expression:(define diff (lambda (x y) (if (> x y) (- x y) (if (< x y) (- y x) 0))))

- Do exercise 2.17, pp. 43-44.

Instructor: Max Hailperin