real analysis ii homework 1 cihanbahran the questions are from folland s text section 3 1 1 prove proposition 3 1 proposition 1 let be a signed measure on x ...
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...Real analysis ii homework cihanbahran the questions are from folland s text section prove proposition let be a signed measure on x m if ej is an increasing sequence in then e lim decreasing and t j nite proof assume that write r for every dene f fj disjoint en snfj n therefore now with ere isanincreasingsequenceinmsuchthats re by rst part note so similarly thus above equality can rewritten as we get null i also measures given since have conversely there exists sets b such observe erb era to keep track of equivalences union being positive hence particular c d moreover xr l fd sup denition z either or any case holds next measurable satises upper bound set desired inequality other direction p hahn decomposition consider which yields suppose efd where extended integrable function describe decompositions negative total variations space clearly mcontained finally...