Thank you, I just back home, 亂彈is senior Mathematician

來源: 於 2010-09-09 19:32:06 [舊帖] [給我悄悄話] 本文已被閱讀：次

He got it. I only explain his last inequality.We draw two lines from (x,g(x)) to (y,g(y))and (x,h(x)) to (y,h(y))...easy to get answer.