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.

--back to combinatorics--

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