3.设(An)是一列集合,作 _(1)=(A)_(1), _(n)=(A)_(n)|(sum _(i=1)^n(A)_(i)) ,n=2, 3,..,证明(Bn)是一列互不相交的集合,-|||-而且 _(i=1)(A)_(i)=U(B)_(i) =1, 2,···

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