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Math Help - A countable union of F segma

  1. #1
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    A countable union of F segma

    prove that

    a countable union and finite intersection of (F segma - sets) is (F segma).
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  2. #2
    MHF Contributor FernandoRevilla's Avatar
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    Re: A countable union of F segma

    Hint: Use that A is an F_{\sigma} set iff A is a denumerable union of closed sets.
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  3. #3
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    Re: A countable union of F segma

    ok

    I`ll start by this idea and I`ll tell you what I get
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