(Sequential Criterion for Continuity) Let (S₁, d₁) and (S2, d2) be metric spaces, and f: S₁ S₂ be a function. Show that f is continuous at the point c E S₁ if and only if for every sequence (xn) in S₁ that converges to c, the sequence f(xn) converges to f(c). (Please use the correct definitions to prove this theorem.)
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- If a functionfis increasing on (a,b) and decreasing on (b,c) , then what can be said about the local extremum offon (a,c) ?A function y=f(x) is uniformly continuous on a set I⊂R if a) in the ε-δ definition of continuity the choice of δ does not depend on ε b) in the ε-δ definition of continuity the choice of δ does not depend on x c) in the ε-δ definition of continuity the choice of δ does not depend on continuity I d) in the ε-δ definition of continuity the choice of δ does not depend on ε e) None of the aboveIs the proof correct? Either state that it is, or circle the first error and explain what isincorrect about it. If the proof is not correct, can it be fixed to prove the claim true?Claim:If f : (0, 1] → R and g : [1, 2) → R are uniformly continuous on their domains, andf(1) = g(1), then the function h : (0, 2) → R, defined by h(x) = f(x) for x ∈ (0, 1] g(x) for x ∈ [1, 2),is uniformly continuous on (0, 2).Proof:Let e > 0.Since f is uniformly continuous on (0, 1], there exists δ1 > 0 such that if x, y ∈ (0, 1] and|x − y| < δ1, then |f(x) − f(y)| < e/2.Since g is uniformly continuous on [1, 2), there exists δ2 > 0 such that if x, y ∈ [1, 2) and|x − y| < δ2, then |g(x) − g(y)| < e/2.Let δ = min{δ1, δ2}.Now suppose x, y ∈ (0, 2) with x < y and |x − y| < δ.If x, y ∈ (0, 1], then |x − y| < δ ≤ δ1 and so |h(x) − h(y)| = |f(x) − f(y)| < e/2 < e.If x, y ∈ [1, 2), then |x − y| < δ ≤ δ2 and so |h(x) − h(y)| = |g(x) − g(y)| < e/2 < e.If x ∈…
- Advanced Calculus: Use the Bolzano–Weierstrass Theorem to prove that if f is a continuous function on [a,b], then f is bounded on [a,b] (that is, there exists M > 0 such that |f(x)| ≤ M for all x ∈[a,b]). (Hint: Give a proof by contradiction.)Using mathematical induction, prove two functions, one linear and one quadratic, are continuous at specific points using the formal definition of a limit. *functions not provided*Let h(x) = {x^2 +3, x<2 {5, x=2 {1/x-2, x>2 Determine the continuity of h(x) at/over the following point/interval. Classify the discontinuity if h(x) is discontinuous at the given point. Provide concise justifications for your answers a. x= 2 b. (0,2] c. (2,∞)
- 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). .Show using Definition 4.3.1(Continuity) that if c is an isolated point ofA ⊆ R, then f : A → R is continuous at c.(Continuous Extension Theorem).(b) Let g be a continuous function on the open interval (a, b). Prove thatg is uniformly continuous on (a, b) if and only if it is possible to definevalues g(a) and g(b) at the endpoints so that the extended function g iscontinuous on [a, b]. (In the forward direction, first produce candidates for g(a) and g(b), and then show the extended g is continuous.)
- 5. Choose whether each of the following statements are true or false.(a) If f is a real-valued continuous function on the closed interval [a; b], then f is uniformly continuous. (b) Let (Mi ; di ) metric spaces for i = 1; 2 and f : M1 → M2 be continuous. Then f(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 product f * g : R→ R is uniformly continuous on R.(Term-by-term Differentiability Theorem). Let fn be differentiable functions defined on an interval A, and assume ∞ n=1 fn(x) converges uniformly to a limit g(x) on A. If there exists a point x0 ∈ [a, b] where ∞ n=1 fn(x0) converges, then the series ∞ n=1 fn(x) converges uniformly to a differentiable function f(x) satisfying f(x) = g(x) on A. In other words, Proof. Apply the stronger form of the Differentiable Limit Theorem (Theorem6.3.3) to the partial sums sk = f1 + f2 + · · · + fk. Observe that Theorem 5.2.4 implies that sk = f1 + f2 + · · · + fk . In the vocabulary of infinite series, the Cauchy Criterion takes the followingform.2. Prove mx+b=mc+b using the definition of a limit of a function where fx=mx+b is a function where m,b∈R and f(x) is a function, f: R → R and R has the usual metric, dRx,y=| x-y |