Logarithmically concave sequence
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In mathematics, a sequence a0, a1, ..., an of nonnegative real numbers is called a logarithmically concave sequence, or a log-concave sequence for short, if ai2 > ai−1ai+1 holds for 1 < i < n − 1.
- Stanley, R. P. (December 1989). "Log-Concave and Unimodal Sequences in Algebra, Combinatorics, and Geometry". Annals of the New York Academy of Sciences 576: 500–535. doi:10.1111/j.1749-6632.1989.tb16434.x.
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