Let (X, T) topological space, where X = {a,b,c,d} and T = {X. Ø, {a}, {a,b}, {a,b,c}} Find a) Basic of (X, T). b) Relative topology to Y = = {a,b}
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- Prove that topological space E is not homeomorphic to the spaceY = {(x, y) ∈ E^2 : y = ± x} (E represents R equipped with Euclidean distance, E^2 represents R^2 equipped with euclidean distance)Let (X, d) be a metric space and let A, B⊆X be such that A is connected, and A∩B ≠ ∅ and A∩ (X − B) ≠ ∅, prove that A∩∂ (B) ≠ ∅. Where ∂ (B) is the boundary of B.let (x,t) be a topological space prove that (x,t) is not connected if and only if there exist A,B belongs to t with x= A union B and A intersect B = zero
- Let (X, T1) and (Y, T2) be topological spaces. Show that the set {U × Y ∣ U ∈ T1} ∪ {X × V ∣ V ∈ T2} is a subbasis for the product topology of X × Y..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.the usual metric space defined by d(x,y)= x-y prove the four propertis of metric space
- Let (X,d) be a metric space with the added condition that for any three points x,y,z in X, d(x,y) <= max{d(x,z),d(y,z)}.(a) Show that every triangle in X is isoceles.(b) An open ball in X with center u in X and radius r > 0 is defined as B(u;r) = {x in X | d(u,x) < r}. Show that every point in an open ball is a center for the open ball. [Hint: Part of your argument might include showing that if v in B(u;r), then B(v;r) = B(u;r).]Let (X, τ) be the topological space A,B⊂X. In this case, show that it is stated in the photo.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.
- A. Let H be the set of all points (x, y) in ℝ2 such that x2 + 3y2 = 12. Show that H is a closed subset of ℝ2 (considered with the Euclidean metric). Is H bounded?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,d) be a metric space. For x,y in X define e(x,y)=min{1,d(x,y)}. Prove that (X,e) is also a metric space.