Question

good evening if Ω is a sample space, τ is a σ-algebra over Ω and Ω’...

good evening

if Ω is a sample space, τ is a σ-algebra over Ω and Ω’ is a non-empty subset of Ω. Show that the following set is also a σ-algebra over Ω’

τ’ = {Α n Ω’ : Α belongs to τ}

I’m stucked in the compliment part, if B is in τ’ then compliment of B is in τ’. Could you please help me!

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