Exercise 6. Prove that if f [a, b] : interval. → R is continuous, then f([a, b]) is a closed and bounded
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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) ?Let f : [0,∞) → R. Assume that f is uniformly continuous on [0, 1] andon [1,∞). Show that it is uniformly continuous on [0,∞)Suppose f : [a,∞) → R is continuous and f(x) → 0 as x →∞. Prove that f is uniformly continuous on [a,∞).
- Use the definition to prove f = (x-1)/(x+1) is uniformly continuous on [0,∞).Let f: X -> Y and g: Y -> Z be uniformly continuous on X and Y, respectively. Prove g ◦ f: X -> Y is uniformly continuous on X.Consider the uniformly continuous function f(X)=√x on [0,1]. For a given ε>0, what is the largest value of δ>0 in the definition of uniform contiunity? a) ε b) ε2 c) √ε d) ε/2 e) ε-2
- Let a, b ∈ R with a < b. Show that a function f : (a, b) → R is uniformly continuous on (a, b) if and only if it can be extended to a continuous function f˜ on [a, b]prove the following version of the First Derivative Test: If f′ is continuous on the interval [a,b] and if f has exactly one critical point c then f has a maximum at c if f′(a′)>0 and f′(b′)<0 for some a′ and b′ such that a<a′<c<b′<bProve that f : [−4,2] → R defined by f(x) = 7/x+5 is uniformly continuous on the interval [−4, 2] using the ε, δ definition of uniform continuity