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Hello, I would be grateful if I could receive some assistance with the following question:
Letbe a
, and let
.
Define
Show thatis a
]
Thank you so much in advance to anybody who helps me with this. This material is so confusing for me, and I'm sure I can get it, but it will take time, practice, and guidance.
I understand so far that if I take B to be the null set (since it is an element of the sigma algebra we are given), that it shows the null set is part of the described set since the intersection of the null set and A would be the null set.
When I start with the intersection of A and B, however, I'm having trouble showing that the complement can be written in the form that satisfies the described set. I'm not sure I'm supposed to go towards the use of DeMorgan's laws to write things as an intersection? So, I'm essentially having a problem showing closure under complements.
I'm also not quite sure why it was necessary that the problem states that complementation is with respect to A?
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Originally Posted by AdvoTV 
