• 2022-06-09
    设[tex=0.857x1.214]6tsj+unAQKUtGD5tL7ewDA==[/tex]是[tex=0.786x1.0]I/kNMtd8YcgkWCrgriW/hA==[/tex]上的函数,证明: [tex=0.857x1.214]6tsj+unAQKUtGD5tL7ewDA==[/tex]在[tex=0.786x1.0]I/kNMtd8YcgkWCrgriW/hA==[/tex]上的可测当且仅当对一切有理数[tex=0.5x0.786]51EIYuoXo3UTYashe96uEQ==[/tex],[tex=7.571x1.357]J40NUMj31BesXCdVzyyGwmPUdeytQoo1BIdzDHwhKqs=[/tex]是可测集.