回複：f(1,1,1,1)=5意思是1,1,1,1用加減乘除算不出5。問題是怎樣證明算不出5？

來源: 於 2010-07-19 17:50:37 [舊帖] [給我悄悄話] 本文已被閱讀：次

You are right,It is very hard to verify "impossibility."Find the bound is possible...