Every closed and bounded subset of X is compa The subset {z EX: |||| ≤ 1} of X is compact... X is finite dimensional.
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- Let (X, d) be a metric space and let A be a non-empty subset of X. Prove that A is open if and only if it can be written as the union of a family of open balls of the form Br(x) = {y ∈ X : d(x, y) < r}.Let X= {A ⊆ ℝ| 1 is not in A and ℝ \ A is finite}. Prove that ℝ is a compact Hausdorff space with respect to X.Is the following statement True or False? Justify each answer. If S is a closed bounded subset of a metric space X, then S is compact.
- Let (X,d) be a metric space and E ⊆ X. Prove that if E is compact, then E is bounded.If A is 3 × 3 with rank A = 2, show that the dimension of the null space of A is 1.Let X be a real normed linear space, and let K be a convex set in X, having 0 as an interior point. Let h be the support functional of K and define K° = {x* € X*: h(x*) < 1}. Now for xe X, let p(x) = sup (x, x*). Show that p is equal to the Minkowski functional of K.
- If τ1 = {A ⊂ X : p ∈ A} ∪ {∅} is a topology on X, then determine whether (X, τ1) is a normalspace or not.Let A be a closed bounded subset of a metric space (X, d). Is A acompact subset? Explain why.If E is a subset of a metric space (X, d), show that E is nowhere-dense in X if and only if E c is dense in X.