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Math Help - Sigma-algebra exercise.

  1. #1
    Junior Member
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    Exclamation Sigma-algebra exercise.

    Hello

    We have the following sample space:  \Omega = \left\{{1,2,3}\right\}

    Is the following event of \Omega a sigma-algebra?

     <br />
A = \left\{{\left\{{\emptyset}\right\},\left\{{1,2,3}\  right\},\left\{{1}\right\},\left\{{2}\right\},\lef  t\{{1,3}\right\},\left\{{2,3}\right\}}\right\}<br />

    I think the union property is not satisfied. Right?

    Thanks
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  2. #2
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    Please do not post twice. EDIT the OP.
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