Explain that there exists a closed set (C)ne satisfying G =C₂ ≤ C₂ ≤ ≤ E and ΕΝ lim ma (E/C₂)=0 for any Lebeck measurable set E≤ Rd. Explain that there is also an 12100 open set (Un) that satisfies U₁ ≥ U₂ ≥ U₂ ≥···≥ E and lim m(U₂/E)=0. nEN 1-0

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