Let P_1 and P_2 be the two partitions of [a,b]. Find a partition P_0 of [a,b] such that P_0 is a refinement of both P_1 and P_2.
How woudl I take the union of P1 and P2 to find this?
Let P_1 and P_2 be the two partitions of [a,b]. Find a partition P_0 of [a,b] such that P_0 is a refinement of both P_1 and P_2.
How woudl I take the union of P1 and P2 to find this?
I've already answered the question for you before. $\displaystyle P_1,P_2\subseteq P_1\cup P_2$