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Open and Closed
A set $X\subseteq\mathbb{R}^n$ is open if and only if its complement $X'=\{\vec{x}\in\mathbb{R}^n, \vec{x}\notin X\}$ is closed.Concepts
Coming soonIf
Coming soonOnly If
Coming soonProof
Coming soonOpen and Closed
A set $X\subseteq\mathbb{R}^n$ is open if and only if its complement $X'=\{\vec{x}\in\mathbb{R}^n, \vec{x}\notin X\}$ is closed.Concepts
Coming soonIf
Coming soonOnly If
Coming soonProof
Coming soon
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concepts
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proof