Let A = [0, 1] and define fn(0) = fn(;) = fn(1) = 0, fn(;) = n and fn to be linear on each of the segments [0, 2], [, and [, 1]. %3| (a) Draw a careful graph of the first few terms of the sequence of functions: fi , f2, f3.
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- Let a > 0 and X1 = √a. Define the sequence Xn = √(a + Xn-1), n ≥ 1.Show that (Xn)n is convergent and determine its limit.Suppose that F(u) denotes the DFT of the sequence of f(x)={1, 2, 3, 4}? What is the value of F(14)? (Hint: DFT periodicity)Find an example of a function f : [−1,1] → R such that for A := [0,1], the restrictionf |A(x) → 0 as x → 0, but the limit of f(x) as x → 0 does not exist. Show why
- In Example 2.4.1, show that fn(x) converges to f(x) pointwise on [0, 1]. (We haveseen the convergence at x = 0, 1.) For x ∈ [0, 1] and positive integer n, let fn(x) = xn.Then limn→∞ fn(x) = f(x),, wheref(x) = 0 if 0 ≤ x < 1,1 if x = 1.This example shows that the pointwise limit of a sequence of continuous functions need not be continuous.Compute the limit as x approaches infinity of x^e-xFInd A and B such that g(x) has limits at x= -1 and x=3
- Let A be the family of functions defined everywhere on ℝ so that limx->∞ f(x) converges. Show that A is an algebra of functions.Suppose that a sequence of differentiable functions {fn} converges pointwiseto a function f on an interval [a,b], and the sequence {f′n}converges uniformlyto a function g on [a,b]. Then show that f is differentiable and f′(x) = g(x)on [a,b].This exercise and the next explore partial converses of the Continuous Limit Theorem (Theorem 6.2.6). Assume fn → f pointwise on [a, b] and the limit function f is continuous on [a, b]. If each fn is increasing (but not necessarily continuous), show fn → f uniformly.
- Let x_1 = 1/2 and, for n ≥ 1, x_(n+1) = √xn. Prove that the sequence (xn)^∞_n=1 converges and find its limit.Which of the following is the limit of the sequence {xn } defined asLet k(x) = h(x) - g(x), where g and h are infinitely differentiable functions from R to R. a. Suppose h'(x) = g'(x) for all x. Characterize the possible functions k(x). b. Suppose h''(x) = g''(x) for all x. Characterize the possible functions k(x). c. Suppose h''(x) = g''(x) for all x. Suppose further that k(0) = 0 and |k'(0)|< 1. Find the limit as n goes to infinity of k(x)n for |x|<1. d. Define f(n) to be the nth derivative of a function mapping R to R. Suppose hn(x) = gn(x) for all x. Suppose k(x1) = k(x2) = ... = k(xn) = 0 for x1 < x2 < x3 < ... < xn . Show that g = h.