问答题求证,Rn-1当作Rn的子集,其n维Lebesgue测度为零
问答题设ARn可测,0≤α≤mA,则BA:mB=α
问答题设A,GRn,mA=0,G为开集,则
问答题设ARn,若ε>0,存在闭集FA与开集GA,使m(G F)<ε,则A可测
问答题设AR可测,a∈R,δ>0,当|x|