Let fbe a continuous function on an open subset U of a Banach spe into a Banach space Y. Let a and b be two distinct points of U such that the seg [a, b] is contained in U, and fbe differentiable at all points of [a, b]. Then
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- Describe the kernel of epimorphism in Exercise 20. Consider the mapping :Z[ x ]Zk[ x ] defined by (a0+a1x++anxn)=[ a0 ]+[ a1 ]x++[ an ]xn, where [ ai ] denotes the congruence class of Zk that contains ai. Prove that is an epimorphism from Z[ x ] to Zk[ x ].A relation R on a nonempty set A is called asymmetric if, for x and y in A, xRy implies yRx. Which of the relations in Exercise 2 areasymmetric? In each of the following parts, a relation R is defined on the set of all integers. Determine in each case whether or not R is reflexive, symmetric, or transitive. Justify your answers. a. xRy if and only if x=2y. b. xRy if and only if x=y. c. xRy if and only if y=xk for some k in . d. xRy if and only if xy. e. xRy if and only if xy. f. xRy if and only if x=|y|. g. xRy if and only if |x||y+1|. h. xRy if and only if xy i. xRy if and only if xy j. xRy if and only if |xy|=1. k. xRy if and only if |xy|1.Consider the mapping :Z[ x ]Zk[ x ] defined by (a0+a1x++anxn)=[ a0 ]+[ a1 ]x++[ an ]xn, where [ ai ] denotes the congruence class of Zk that contains ai. Prove that is an epimorphism from Z[ x ] to Zk[ x ].
- 26. Let and. Prove that for any subset of T of .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.Let (X1, d1) and (X2, d2) be metric spaces and f : X1 -> X2 be a continuous function. Prove that if a is an adherence point of A ⊆ X, then f(a) is an adherence point of f(A). Thank you
- If the function f is continuous on the closed interval [a, b], then there exists at least one point c element of (a, b) such thatLet A = {0, 1} with the discrete topology and let f : A → R be defined by f(0) = −1, f(1) = 1. Show that f is continuous.This is a real analysis question. Suppose that (X,d) and (Y,ρ) are metric spaces. (i)The function f:X→Y is continuous if f^(−1) (E) ⊆ X is open whenever E ⊆Y is open. (ii) The function f : X → Y is continuous if for every x ∈ X and for every ε > 0, there exists a δ > 0 such that y ∈ X with d(x,y) < δ implies ρ(f(x),f(y)) < ε. The goal of this problem is to prove a third equivalent characterization. (iii) The function f : X → Y is continuous if for every x ∈ X and for every sequence {xn, n ∈ N} ⊆ X that converges to x, the sequence {f(xn), n ∈ N} ⊆ Y converges to f(x). That is, for every x ∈ X, if lim n→∞ d(xn, x) = 0, then lim n→∞ ρ(f(xn), f(x)) = 0. (a) Prove that (iii) implies (ii). (b) Prove that (i) implies (iii). .
- Let T be a linear operator on a finite-dimensional inner product space V. (a) If T is an orthogonal projection, prove that ||T(x)||≤||x|| for all x ∈V. Give an example of a projection for which this inequality does not hold. What can be concluded about a projection for which the inequality is actually an equality for all x∈V? (b) Suppose that T is a projection such that ||T(x)||≤||x||for x ∈V.Prove that T is an orthogonal projection.5. Choose whether each of the following statements are true or false.(b) Let (Mi,di) metric spaces for i = 1,2 and f : M1 → M2 be continuous. Thenf(U) is open in M2 for all open subset U in M1. (c) Every homeomorphism is uniformly continuous. (d) Every contraction mapping has a fixed point.(e) An identity function on any metric space is a contraction.(f) A surjective isometry is a homeomorphism. (g) If f,g : R→R are uniformly continuous function on R then the produc15. 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 necessarily complete.