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Math Help - Algebras of sets

  1. #1
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    Algebras of sets

    When operating with sigma algebras, what does it mean when we talk about a countably infinite set? And, what are then closed countably infinite interesections?
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  2. #2
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    Quote Originally Posted by seigna View Post
    When operating with sigma algebras, what does it mean when we talk about a countably infinite set? And, what are then closed countably infinite interesections?

    Countable infinite set = a set equipolent with the set of all natural numbers. How come you don't know this if you're dealing

    with \sigma -algebras??

    Tonio
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  3. #3
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    Well, ask my prof... he never introduced the topic, just went of with it during the lecture... maybe the others know it from high school... dunno.

    Thanks for the answer.
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