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The Ratio Monotonicity of the q-Derangement Numbers
q-derangement number spiral property log-concavity ratio monotone property
2014/6/3
We introduce the notion of ratio monotonicity for polynomials with nonnegative coefficients, and we show that for n ≥ 6, the q-derangement numbers Dn(q) are strictly ratio monotone, except for the las...