(4) Suppose f(x) is increasing on [a,b]. Let P₁ = {xo, ₁,...,n}, where xk = a + k (b − a), k = 0, 1,..., n. Prove that and [ f(x) dx 0 ≤ U(³Pm S) - fº f(x) dx ≤ b=ª (ƒ(1) — S (a)) n = lim U(Pn, f). 8个

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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(4) Suppose f(x) is increasing on [a, b]. Let Pn
[a, b]. Let P₁ = {0, ₁,...,n}, where x = a + (b − a),
k/2
n
k = 0, 1, . . . , n. Prove that
9.9
[1(2)
and
b
- [* F(x) dx ≤ b = ª (f(0) - F(a))
f(x²)
a (ƒ(b)
<
N
0 ≤ U(Pn, f) -
f(x) dx lim U(Pn, f).
n→∞
=
Transcribed Image Text:(4) Suppose f(x) is increasing on [a, b]. Let Pn [a, b]. Let P₁ = {0, ₁,...,n}, where x = a + (b − a), k/2 n k = 0, 1, . . . , n. Prove that 9.9 [1(2) and b - [* F(x) dx ≤ b = ª (f(0) - F(a)) f(x²) a (ƒ(b) < N 0 ≤ U(Pn, f) - f(x) dx lim U(Pn, f). n→∞ =
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