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.

Examples of log-concave sequences are given by the binomial coefficients along any row of Pascal's triangle.

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