simply scheme 第十三章 练习

<!-- @page { margin: 2cm } PRE.western { font-family: "DejaVu Sans Mono", monospace } PRE.cjk { font-family: "AR PL UKai CN", monospace } PRE.ctl { font-family: "DejaVu Sans Mono", monospace } P { margin-bottom: 0.21cm } -->

13.1

3 calls ape pe e

13.2

13.3

13.4

n never reduce to a smaller n

13.5

13.6

I know but how to expain