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Assume A is an open set what can you say about set Pe1(A), wherePe1(A) is an...

Assume A is an open set what can you say about set Pe1(A), wherePe1(A) is an orthogonal projection of A onto subspace orthogonal to the first basisvectore1, i.e.Pe1(A) ={(0,a2,...,ad) : (a1,a2,...,ad) ∈ A} .

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