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Closure under Vector Addition

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This video explains what it means for a subset of R^n to be closed under addition. This is one of the conditions for a subset of R^n to be a subspace.
Reading: Lay, Linear Algebra, 3rd. ed., section 2.8: Subspaces of R^n
Reading: Lay, Linear Algebra, 3rd. ed., section 2.8: Subspaces of R^n