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[11R] Let \(X\) be a vector space and \(A,Bβ X\). We define the Minkowski sum \(A β Bβ X \) as
\[ A β B=\{ x+y : xβ A, yβ B\} ~ ~ . \]
[11R] Let \(X\) be a vector space and \(A,Bβ X\). We define the Minkowski sum \(A β Bβ X \) as