Lemma 2.56 Let (X,T) be a topological space, (M, d) be a complete metric space and BC(X, M) := {f e C(X, M); ƒ[X] is bounded } doo(f, 9) := sup d(f(x), g(x)) xɛX (f, g € BC(X, M)). Then (BC(X, M), d) is a complete metric space.
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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)A. Let H be the set of all points (x, y) in ℝ2 such that x2 + xy + 3y2 = 3. Show that H is a closed subset of ℝ2 (considered with the Euclidean metric). Is H bounded?A. Let H be the set of all points (x, y) in ℝ2 such that x2 + xy + 3y2 = 3. Show that H is a closed subset of ℝ2 (considered with the Euclidean metric). Is H bounded?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?
- the usual metric space defined by d(x,y)= x-y prove the four propertis of metric space(a) Supply a definition for bounded subsets of a metric space (X, d). (b) Show that if K is a compact subset of the metric space (X, d), then K is closed and bounded. (c) Show that Y ⊆ C[0, 1] from Exercise 8.2.9 (a) is closed and bounded but not compact.1. a) Let (x, d) be a metric space. Define a flow on (x, d). b) Let (x, {ϕt}) be a flow on a metric space X. When is xo in x a fixed point of the flow? c) When do you say that a fixed point xo in x is Poincare stable? d) When do you say that a fixed point xo is Lypanov stable?
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- 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 (X,T) be a topological space. Then a function f is continuous at x0 element of X if and only if f is both lower semi continuous and upper semi continuous at x0 element of X.True or False: a)Every subset of a topological space is either open or closed.b)If X is a topological space with the discrete topology and if Xhas least two elements, then X is not connected.c) True or False: If X is a topological space, then there always is a metric on Xwhich gives rise to its topology.d) True or False: If X and Y are topological spaces and if f : X → Y is a constantmap (which means that there is a point y ∈ Y such that f(x) = y for all x ∈ X),then f is continuous.e) True or False: If X is a topological space, then X is both open and closed