Add solution for exercise3-13

Author: ramsayleung

chapter3/exercise3-13.org

@@ -0,0 +1,9 @@
+#+LATEX_CLASS: ramsay-org-article
+#+LATEX_CLASS_OPTIONS: [oneside,A4paper,12pt]
+#+AUTHOR: Ramsay Leung
+#+EMAIL: [email protected]
+#+DATE: 2025-06-12 Thu 22:08
+
+[[file:../img/chapter3/exercise-3-13.png]]
+
+如果我们试着去计算 =(last-pair z)=, 因为 =z= 是一个环，那么尝试找到最后一个序列的操作就会失败，会在环里一直打转，无限循环，直至 =stackoverflow=