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Entropic versions of Bergstr\"om's and Bonnesen's inequalities
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Entropic versions of Bergstr\"om's and Bonnesen's inequalities
abstract
We establish analogues of the Bergstr\"om and Bonnesen inequalities, related to determinants and volumes respectively, for the entropy power and for the Fisher information. The obtained inequalities strengthen the well-known convolution inequality for the Fisher information as well as the entropy power inequality in dimensions $d>1$, while they reduce to the former in $d=1$. Our results recover the original Bergstr\"om inequality and generalize a proof of Bergstr\"om's inequality given by Dembo, Cover and Thomas. We characterize the equality case in our entropic Bonnesen inequality.
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