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    Real analysis

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    1- if A1,A2,A3,...,Am are each countable sets, then the union A1 U A2 U A3...U Am is countable

    2- if An is a countable set for each n belong to N,then Un=1(to infinity) An is countable

    © BrainMass Inc. brainmass.com March 4, 2021, 6:02 pm ad1c9bdddf
    https://brainmass.com/math/real-analysis/real-analysis-25452

    Solution Summary

    This is a proof regarding countability of sets.

    $2.19

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