solutions to exercises for section 1.2.2 of SICP. ex 1.13 is a proof, and is on p.13-14 of my notebook
adding exercises for chapter 1.2.3. ex 1.15 is on p.14 of my notebook
problems from section 1.2.4 in SICP
Two questions about exercise 1.22: Is there a better way to have Scheme execute multiple commands as one of the cases in an if statement than just putting them inside an (and ...) statement? Is is possible to solve this problem without modifying the provided timed-prime-test code?