…………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………好的数学书全是外国人写的！！！这么伟大的发现是不是给个诺贝尔奖啊…………………………………………………………………………………………………………………………………………