Should the answer be unique?

來源: 於 2009-11-28 20:46:23 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

What is (2^0.5)^(2^0.5)^(2^0.5)...

Here is the solution.

Let it be x, then we get x=(2^0.5)^x. It seems it will lead x=2 or 4.

Should the answer be unique?