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1 (exercise). 8. 1. Let Ω Φ 0 be arbitrary and if = {{ω}|ω6Ω} the system of all one-point sets in Ω. 1. 0t{if) = %00{if) is the system of all finite subsets of Ω. 2. 3* (if) is the system of all sets ç Ω that are either finite or have a finite complement. 3. ^(if) is the system of all (at most) countable subsets of Ω. 4. 0&(if) is the system of all sets ç Ω that are either countable or have a countable complement. 2. Let 0t be à ring in Ω φ 0 . 3. , F„}. Let Q 0 = F 1 u * " u F n . , n, let F° = Fk, Fj} = Q 0 \F fc .

1. If F e m, then clearly m(F) = sup m(E) = 3tsE^F inf m(G). F Ç Ge£ 2. We start by proving that ${m) is a ring. Let F, F' G &m\ we show that F u F' s @(m). Let ε > 0 be arbitrary and F, G, F', G e m be such that 40 I. POSITIVE CONTENTS AND MEASURES F ç F ç G , F ç F < = G ' and m{G\E) < ε/2 > m(G'\F). Clearly E u F, GuG'elJuFçFuFçGuG', m((G u G')\(E u £')) ^ m((G\E) u (G'\F)) ^ m(G\F) + πιψ'ψ') < ε/2 + e/2 = ε. (m) goes similarly and is left as an exercise to the reader. Next we show that the extended (according to 1) m is additive again (its nonnegativity is obvious).

N). Prove that ^(R n ) is generated by the system y = (J {Uk~ i x F x R"-fc-l \F e