Theorem 1 Let $R, S \subseteq \mathbb{R}^n$. Then 1. $S^\perp \subseteq \mathbb{R}^n$. 2. $S \oplus S^\perp = \mathbb{R}^n$. 3. $(S^\perp)^\perp = S$. 4. $R \subseteq S$ if and only if $S^\perp \subseteq R^\perp$. 5. $(R+S)^\perp = R^\perp \cap S^\perp$. 6. $(R \cap S)^\perp = R^\perp + S^\perp$.
Added by Samuel P.
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