18466163 6c29b38205460d477e8da7ebdd0b50b1 zx31415 http://gravatar.com/zx31415 zx31415 http://2.gravatar.com/avatar/6c29b38205460d477e8da7ebdd0b50b1 http://2.gravatar.com/avatar/6c29b38205460d477e8da7ebdd0b50b1 thumbnail Xiao Zhang Xiao Zhang zx31415 If people do not believe that mathematics is simple, it is only because they do not realize how complicated life is. ------John von Neumann HK zx31415@gmail.com true msn zhangxiaojohn@hotmail.com