b Let F be a collection of closed sets Then uniondisplay B G B is closed FALSE

B let f be a collection of closed sets then

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(b) LetFbe a collection of closed sets. ThenuniondisplayBis closed. (c) Ifpis an isolated point ofS,thenpis a boundary point ofS. 2
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(d) Ifxis an interior point ofS, thenxis an accumulation point ofS. (e) Ifxis a boundary point ofS,thenxis an accumulation point ofS.
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