Let f: X, Y be a continuous surjection between metric spaces. If X is compact then A. X is complete B. Y is connected. C. Y is not compact. D. Y is not neccessarily complete.
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- If x and y are elements of an ordered integral domain D, prove the following inequalities. a. x22xy+y20 b. x2+y2xy c. x2+y2xyLet (X.d) be a metric space, x ∈ X, epsilon > 0, and E = { y∈ X: d(x,y) ≤ epsilon}. Show that E is closed.Show that the real number R with d(x,y)=|x-2y| are not a metric space .
- Let (X,d) be a metric space and E ⊆ X. Prove that if E is compact, then E is bounded.b)Let E be a non-empty subnset of a metric space(X,d),define the distance of x fromE by: ρE(x)=inf∈Ed(x,z).Let E and F be compact sets in a metric space (X,d). Show that E U F is compact using the definition of compactness.
- Consider a set A and a function d: A × A → R that satisfies:• d(x, y) = 0 ⇔ x = y;• d(x, y) = d(y, x);• d(x, y) ≤ d(x, z) + d(z, y).Prove that (A, d) is a metric space, i.e. show that d(x, y) ≥ 0 forall x, y ∈ A.Let (X, T ) be a topological space, (M, d) be a complete metric space andBC(X, M) := {f ∈ C(X, M); f[X] is bounded }d∞(f, g) := sup d(f(x), g(x)) (f, g ∈ BC(X, M)).Then (BC(X, M), d∞) is a complete metric space.Let f: X Y be a continuous surjection between metric spaces. If X is compact then ............................. A. X is complete B. Y is connected. C. Y is not compact. D. Y is not neccessarily complete.
- 2.) Let (S, d) be a metric space and suppose that ρ : S × S → R is defined byρ(x, y) = d(x, y)1 + d(x, y)for all points x, y ∈ S. Prove that (S, ρ) is a metric space, that it is bounded and thatρ(x, y) ≤ d(x, y) for all x, y ∈ S.Let (X1, d1) and (X2, d2) be separable metric spaces. Prove that product X1 × X2 with metric d((x1, x2), (y1, y2)) = max{d1(x1, y1), d2(x2, y2)} is also separable space.Consider the set F=(-infinity, 1) U (9,infinity) as a subset of R with d(x,y)=abs(x-y). Show f is not compact by creating an open cover of F that has no finite subcover.