19.2. Let f : [a,b] → R be integrable. Show that rb 72 (r)dz, un 0O i=1 where a, b > 0 and h (b/a...
Please all thank you Exercise 25: Let f 0,R be defined by f(x)-1/n, m, with m,nENand n is the minimal n such that m/n a) Show that L(f, P)0 for all partitions P of [0, 1] b) Let mE N. Show that the cardinality of the set A bounded by m(m1)/2. e [0, 1]: f(x) > 1/m) is c) Given m E N construct a partition P such that U(f, Pm)2/m. d) Show that f is integrable and compute Jo...
3. Let f, g : a, b] → R be functions such that f is integrable, g is continuous. and g(x) 〉 0 for all x є a,b]. Since both f, g are bounded, let K 〉 0 be such that |f(x) K and g(x) < K for all x E [a,b (a) Let n > 0 be given. Prove that there is a partition P of [a, b such that for all i 2. (b) Let P be a...
3. Let f, g : [a,b] → R be functions such that f is integrable, g is continuous, and g(x) >0 for all r E [a, b] Since both f,g are bounded, let K >0 be such that lf(z)| K and g(x) K for all x E [a3] (a) Let n > 0 be given. Prove that there is a partition P of [a, b such that U (P. f) _ L(P./) < η and Mi(P4)-mi(P4) < η for all...
7. Let S = [0, 1] × [0, 1] and f : S → R be defined by f(x, y) = ( x + y, if x 2 ≤ y ≤ 2x 2 , 0, elsewhere. Show that f is integrable over S and calculate R S f(z)dz.
Suppose f is integrable on (-π, π] and extended to R by making it periodic of period 2π. Show that f(x) dx= | f(x)dz where I is any interval in R of length 2π Hint: I is contained in two consecutive intervals of the form (kT, (k+2)π) Suppose f is integrable on (-π, π] and extended to R by making it periodic of period 2π. Show that f(x) dx= | f(x)dz where I is any interval in R of length...
(1) Let 0 0O | f(x) dx +ynf(n). 1(f)= Show that I K(R)R is a well-defined positive linear functional. Then find a regular Borel measure μ such that 1(f)-Jfd,1 for every f K(R). (1) Let 0 0O | f(x) dx +ynf(n). 1(f)= Show that I K(R)R is a well-defined positive linear functional. Then find a regular Borel measure μ such that 1(f)-Jfd,1 for every f K(R).
1. Let a, b E R with a < b and P= {20, 21, ..., In} be a partition of the interval [a, b]. Denote At; = x; – X;-1 for j = 1,2,...,n. Consider a function f : [a, b] → R. (a) (4 points) What do we need to require from f in order to be able to define the upper and lower Riemann sums of f over P? (b) (8 points) Define the upper and the lower...
Problem 1. Consider the function f(x)- 3.12 show that f is Riemann integrable on [0.2] and use the definition to find .后f(x)dr Problem 2. Consider the function -2, zEQ 2, O f(r) = Show that f is not Riemann integrable on 0,1 but s Reemann integrable on this interval. Problem 3. (a) Let f be a real-valued function on a, b] such thatf()0 for all c, where c E [a, b Prove that f is Riemann integrable on a, b...
2. (a) Suppose that f is Lebesgue integrable on R. Find the following limit: n sin(x/n f(x) dz. (b) Find the value of the limit in the special case: linn onsin(x/n) n→oo/.oo X(X2 + 1) dx. 2. (a) Suppose that f is Lebesgue integrable on R. Find the following limit: n sin(x/n f(x) dz. (b) Find the value of the limit in the special case: linn onsin(x/n) n→oo/.oo X(X2 + 1) dx.
Problem 4: Let f: [0, 1] → R be an integrable function that is continuous at 0. Prove that lim f(") dx = f(0). n+Jo [ Hint: there are several approaches. It might help to first show that for a fixed 0 <b< 1, we have limn700 Sº f(x) dx = b. f(0). ]