Sigma-algebra exercise.

**osodud** · September 6th 2010, 09:21 AM

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

**Plato** · September 6th 2010, 09:24 AM

Please do not post twice. EDIT the OP.

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