3. (pp. 592, Marsden & Hoffman] Suppose that f:1-1, 1] → R is differentiable on (–,],...
1. (pp. 592, Marsden & Hoffman) For each of the functions determine what type of convergence the Fourier series will have and if we can differentiate the series. b) f (x) = T – x2 on (-7,].
2. [pp. 492, Marsden & Hoffman] Let p [a, bR and :R R be continuous. Show that R} C R2 /-{(z, p (x)) : x e [a, b]} C R2 has volume zero in R2 and the set B-{(x, ψ(x)) : x has measure zero in R ie set F 2. [pp. 492, Marsden & Hoffman] Let p [a, bR and :R R be continuous. Show that R} C R2 /-{(z, p (x)) : x e [a, b]} C R2...
2. Let f: R R be a continuous function. Suppose that f is differentiable on R\{0} and that there exists an L e R such that lim,of,(z) = L. Prove that f is differentiable at 1-0 with f,(0) = L. (Hint: Use the definition of derivative and then use mean value theorem) 2. Let f: R R be a continuous function. Suppose that f is differentiable on R\{0} and that there exists an L e R such that lim,of,(z) =...
Now suppose f' is continuous and f" is piecewise continuous on (0, L). (b) If f(0) = f(L) = 0, then O f(x) = į bn sin ηπα L 0<x<L, n=1 612 Chapter 11 Boundary Value Problems and Fourier Expansions with bn = 2L n272 S“ r"(a)sin пах dr. L (11.3.5) Solve the initial-boundary value problem. Theorem 11.3.5 (b) will simplify the computa- tion of the coefficients in the Fourier sine series. Uit = 64uze, 0<r <3, t > 0,...
(a) Suppose f is continuously differentiable on the closed and bounded interval I = [0, 1]. Show that f is uniformly continuous on I. (b) Suppose g is continuously differentiable on the open interval J = (0,1). Give and example of such a function which is NOT uniformly continuous on J, and prove your answer.
Exercise 1. Let f : R R be differentiable on la, b, where a, b R and a < b, and let f be continuous on [a, b]. Show that for every e> 0 there exists a 6 > 0 such that the inequality f(x)- f(c) T-C holds for all c, x E [a, 히 satisfying 0 < |c-x| < δ
2. Let f R R and g R-R be functions that are continuous on1,1 and differentiable on (1,1). Suppose that f(-1-f(1) and 9(-1). Show that there exists c e (1,1) such that 2. Let f R R and g R-R be functions that are continuous on1,1 and differentiable on (1,1). Suppose that f(-1-f(1) and 9(-1). Show that there exists c e (1,1) such that
1) Suppose f (a, b) R is continuous. The Carathéodory Theorem says that f(x) is differentiable at -cE (a, b) if 3 (a, b)-R which is continuous, and so that, (a) Show, for any constant a and continuous function (x), that af(x) is continuous at z-c by finding a Carathéodory function Paf(x). (b) Show, for any constants a, B, that if g : (a, b) -R is differentiable at c, with Carathéodory function pg(z), then the linear combination of functions,...
3. (a) Suppose f : (a, b) + R is differentiable, and there exists M E R such that If'(x) < M for all x € (a, b). Prove that f is uniformly continuous on (a, b). (b) Let f : [0, 1] → [0, 1] be a continuous function. Prove that there exists a point pe [0, 1] with f(p) = p.
A function is defined over (0,3) by f(3) = 12 +1. We then extend it to an even periodic function of period 6 and its graph is displayed below. 2 15 0.5 5 10 15 х -0.5 The function may be approximated by the Fourier series f () = ap + 01 (an cos ( 122 ) + bn sin (022)). where L is the half-period of the function. Use the fact that f(x) sin is an odd functions, enter...