Question

In: Advanced Math

(a) Let <X, d> be a metric space and E ⊆ X. Show that E is...

(a) Let <X, d> be a metric space and E ⊆ X. Show that E is connected iff for all p, q ∈ E, there is a connected A ⊆ E with p, q ∈ E.
b) Prove that every line segment between two points in R^k
is connected, that is Ep,q = {tp + (1 − t)q |
t ∈ [0, 1]} for any p not equal to q in R^k.
C). Prove that every convex subset of R^k is connected.

Solutions

Expert Solution


Related Solutions

(Connected Spaces) (a) Let <X, d> be a metric space and E ⊆ X. Show that...
(Connected Spaces) (a) Let <X, d> be a metric space and E ⊆ X. Show that E is connected iff for all p, q ∈ E, there is a connected A ⊆ E with p, q ∈ E. b) Prove that every line segment between two points in R^k is connected, that is Ep,q = {tp + (1 − t)q | t ∈ [0, 1]} for any p not equal to q in R^k. C). Prove that every convex subset...
Q2. Let (E, d) be a metric space, and let x ∈ E. We say that...
Q2. Let (E, d) be a metric space, and let x ∈ E. We say that x is isolated if the set {x} is open in E. (a) Suppose that there exists r > 0 such that Br(x) contains only finitely many points. Prove that x is isolated. (b) Let E be any set, and define a metric d on E by setting d(x, y) = 0 if x = y, and d(x, y) = 1 if x and y...
Let (X, d) be a metric space. Prove that every metric space (X, d) is homeomorphic...
Let (X, d) be a metric space. Prove that every metric space (X, d) is homeomorphic to a metric space (Y, dY ) of diameter at most 1.
1(i) Show, if (X, d) is a metric space, then d∗ : X × X →...
1(i) Show, if (X, d) is a metric space, then d∗ : X × X → [0,∞) defined by d∗(x, y) = d(x, y) /1 + d(x, y) is a metric on X. Feel free to use the fact: if a, b are nonnegative real numbers and a ≤ b, then a/1+a ≤ b/1+b . 1(ii) Suppose A ⊂ B ⊂ R. Show, if A is not empty and B is bounded below, then both inf(A) and inf(B) exist and...
Let (X,d) be a metric space. The graph of f : X → R is the...
Let (X,d) be a metric space. The graph of f : X → R is the set {(x, y) E X X Rly = f(x)}. If X is connected and f is continuous, prove that the graph of f is also connected.
Answer for a and be should be answered independently. Let (X,d) be a metric space, and...
Answer for a and be should be answered independently. Let (X,d) be a metric space, and a) let A ⊆ X. Let U be the set of isolated points of A. Prove that U is relatively open in A. b) let U and V be subsets of X. Prove that if U is both open and closed, and V is both open and closed, then U ∩ V is also both open and closed.
Show that id D is dense metric space of X and if all cauchy sequences Yn...
Show that id D is dense metric space of X and if all cauchy sequences Yn from a sense set D converge in D then X is complete.
Let X be a metric space and t: X to X be a map that preserves...
Let X be a metric space and t: X to X be a map that preserves distances: d(t(x), t(y)) = d(x, y). Give an example in whicht is not bijective. Could let t: x to x+1,x non-negative, but how does this mean t is not surjective? Any help will be much appreciated!
Let (X, dX) and (Y, dY) be metric spaces.Define the function d : (X × Y...
Let (X, dX) and (Y, dY) be metric spaces.Define the function d : (X × Y ) × (X × Y ) → R by d ((x1, y1), (x2,y2)) = dx(x1,x2)+dy(y1,y2) Prove that d is a metric on X × Y .
18.2.6. Problem. Let M be a metric space with the discrete metric. (a) Which sequences in...
18.2.6. Problem. Let M be a metric space with the discrete metric. (a) Which sequences in M are Cauchy? (b) Show that M is complete.
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT