Let A ⊂ R^n , prove that the boundary of A (∂A) is a closed set. HINT: Who is the complement of ∂A? Write this complemen

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answerhappygod
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Let A ⊂ R^n , prove that the boundary of A (∂A) is a closed set. HINT: Who is the complement of ∂A? Write this complemen

Post by answerhappygod »

Let A ⊂ R^n , prove that the boundary of A (∂A) is a closed
set.
HINT: Who is the complement of ∂A? Write this complement as the
disjoint union of two known sets and use the definition of each of
them.
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