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If you don't understand the topic and still try to answer to get some credit i...

If you don't understand the topic and still try to answer to get some credit i will report it right away

Upper sum and lower sum

Lemma: if P is a subset of Q, then L(f,p)<=L(f,Q) and U(f,P)>=U(f,Q)

why??? for P is a subset of Q, however, why the upper sum of U(f,P) is even bigger than or equal to U(f,Q) it doesn't make any sense. Please

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