−−−−−−−−−−−−−−−下面是原文第9页−−−−−−−−−−−−−−−
\quad\quad如果我们再稍微仔细些研究α>β的情况,显然,小的这个数β如果是有理数,那么当然属
于A1A_{1}A1,因为既然在A1A_{1}A1中存在一个数a1′a_{1}'a1′=b2′b_{2}'b2′属于B2B_{2}B2,于是有,不管β是B1B_{1}B1的最大值还是
B2B_{2}B2的最小值,都有β≤a1′a_{1}'a1′,因此β属于A1A_{1}A1<
−−−−−−−−−−−−−−−下面是原文第9页−−−−−−−−−−−−−−−
\quad\quad如果我们再稍微仔细些研究α>β的情况,显然,小的这个数β如果是有理数,那么当然属
于A1A_{1}A1,因为既然在A1A_{1}A1中存在一个数a1′a_{1}'a1′=b2′b_{2}'b2′属于B2B_{2}B2,于是有,不管β是B1B_{1}B1的最大值还是
B2B_{2}B2的最小值,都有β≤a1′a_{1}'a1′,因此β属于A1A_{1}A1<