Fixed ref to appendix

liuxinyu95 · liuxinyu95 · commit 4ddef81f5d36 · 2017-12-10T20:41:01.000+08:00
diff --git a/datastruct/tree/AVL-tree/avltree-en.tex b/datastruct/tree/AVL-tree/avltree-en.tex
@@ -324,7 +324,7 @@ \section{Insertion}
 \end{array}
 \ee
 
-The proof of this equation can be referred from Appendix D.
+The proof of this equation can be referred from Appendix C.
 
 The next problem is to determine the new balance
 factor $\Delta'$ before performing balance adjustment.
