Question: This is a question on Riemann Integral. Could someone help me prove the Upper sum part of Lemma 7.2.3? please prove U(f,P)>= U(f,Q) Definition 7.2.2.

This is a question on Riemann Integral. Could someone help me prove the Upper sum part of Lemma 7.2.3?

please prove U(f,P)>= U(f,Q)

Definition 7.2.2. A partition Q is a refinement of a partition P, written PC Q, if Q contains all of the points of P. Lemma 7.2.3. If P C Q, then L(f, P)

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