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4. Let (X,T) be a a topological vector space, and A

Prove the following: (a) Aˉ=⋂U∈F(0)A+U. (b) Aˉ+Bˉ⊂A+B. (c) Use (3)(b) to show that: If Y⊂X is a linear subspace, then Yˉ is also a subspace. student ...

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