Q.For any subset U of a vector space V, we have U⊥ ⊥ = {v: v is orthogonal to x for some x ∈ U}. Find (U⊥ ⊥) where U = {(2, 0, 0)}, (1, 0, 3).
Correct answer: {(x, y, z): y = 0}
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