问答题

设E是中的稠密集(),f是上的实函数,使得对每个x∈E,截口fx是Lebesgue可测的,且对几乎所有的y∈,截口fy是连续的.证明f在上是Lebesgue可测的.

A.174.24.96:6088/Latex/latex.action?latex=XG1hdGhiYntSfV4x'
B.174.24.96:6088/Latex/latex.action?latex=XGJhcntFfT1cbWF0aGJie1J9XjE%3D'
C.174.24.96:6088/Latex/latex.action?latex=XG1hdGhiYntSfV4y'
D.174.24.96:6088/Latex/latex.action?latex=XG1hdGhiYntSfV4x'
E.证明f在F.174.24.96:6088/Latex/latex.action?latex=XG1hdGhiYntSfV4y'
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