U



Unimodality

A sequence of numbers which increases up to a largest value and then decreases (or vice versa). I.e. if s1, s2, s3, ... sn is a sequence, it is unimodal if there is a t such that s1 <= s2 <= ... <= st, and st >= st+1 >= ... >= sn.


A - B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q - R - S - T - U - V - W - X - Y - Z


An On-line Dictionary of Combinatorics