# U

## Unimodality

A sequence of numbers which increases up to a largest value and then
decreases (or vice versa). I.e. if
* s*_{1}, s_{2}, s_{3}, ... s_{n}
is a sequence, it is unimodal if there is a *t* such that
* s*_{1} <= s_{2} <= ... <= s_{t}, and
*s*_{t} >= s_{t+1} >= ... >= s_{n}.

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An On-line Dictionary of Combinatorics