Propose a limited function f: [a, b] → R and two P and Q partitions of the closed interval [a, b] such that λ (P) <λ (Q) but Sp(f) = SQ(f) and Wp (P) = WQ(f).

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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Propose a limited function f: [a, b] → R and two P and Q partitions of the closed interval [a, b] such that λ (P) <λ (Q)

but Sp(f) = SQ(f) and Wp (P) = WQ(f).

Note:

S is the lower sum of the Riemann sums.

W is the upper sum of the Riemann sums

Both sums are Riemann-integratable

Expert Solution
Step 1

It is given that Q  is a refinement of P.

Let P=I1,I2,I3,In be the partition of a,b.

Thus,

Mk=sup f, mk=inf f

And  Q=J1,J2,J3,Jnbe the partition of a,b.

Mk'=sup f, mk'=inf f

If pklqk then JlIk

Ml'Mk, mkml' for pklqk

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