High Quality Content by WIKIPEDIA articles!n mathematics, a partition of an interval [a, b] on the real line is a finite sequence of the form a = x0 x1 x2 ... xn = b. Such partitions are used in the theory of the Riemann integral, the Riemann-Stieltjes integral and the regulated integral. A refinement of a partition, P, is another partition, Q, of the given interval that contains all the points of P and possibly some other points as well; the partition Q is said to be finer than P. Given two partitions, P and Q, one can always form their common refinement, denoted P Q, which consists of all the points of P and Q, re-numbered in order.