Positive stable densities and the bell-shape

@inproceedings{Simon2017PositiveSD,
  title={Positive stable densities and the bell-shape},
  author={Thomas Simon},
  year={2017}
}
We show that positive stable densities are bell-shaped, that is their n-th derivatives vanish exactly n times on (0,+∞) and have an alternating sign sequence. This confirms the graphic predictions of Holt and Crow (1973) in the positive case. 

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