Abstract
We investigate the interactions of functional rearrangements with Prékopa–Leindler type inequalities. It is shown that certain set theoretic rearrangement inequalities can be lifted to functional analogs, thus demonstrating that several important integral inequalities tighten on functional rearrangement about “isoperimetric” sets with respect to a relevant measure. Applications to the Borell–Brascamp–Lieb, Borell–Ehrhard, and the recent polar Prékopa–Leindler inequalities are demonstrated. It is also proven that an integrated form of the Gaussian log-Sobolev inequality sharpens on rearrangement.
A portion of this work relevant to information theory was announced at 56th Annual Allerton Conference on Communication, Control, and Computing [43].
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Notes
- 1.
This follows from the fact that Borel sets are analytic, see [28], and analytic sets are closed under summation and universally measurable.
- 2.
Note that when \(f = \frac {d\nu }{d\mu }\) is the density function of a probability measure ν with respect to μ, H μ(f) is the Kullback–Liebler divergence D(ν||μ) or relative entropy [22].
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Melbourne, J. (2019). Rearrangement and Prékopa–Leindler Type Inequalities. In: Gozlan, N., Latała, R., Lounici, K., Madiman, M. (eds) High Dimensional Probability VIII. Progress in Probability, vol 74. Birkhäuser, Cham. https://doi.org/10.1007/978-3-030-26391-1_7
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