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Sahithyan's S1
Sahithyan's S1 — Mathematics

Refinements

QQ is called a refinement of P    P \iff PP and QQ are partitions of [a,b][a,b] and PQP\subseteq Q.

In that case:

L(f;P)L(f;Q)U(f;Q)U(f;P)L(f;P) \le L(f;Q) \le U(f;Q) \le U(f;P)

If P1P_1 and P2P_2 are partitions of [a,b][a,b], then Q=P1P2Q=P_1\cup P_2 is a refinement of both P1P_1 and P2P_2.