Entropy 2012, 14(8), 1469-1477; doi:10.3390/e14081469

An Integral Representation of the Relative Entropy

1email, 1email and 2,* email
Received: 15 June 2012; in revised form: 28 July 2012 / Accepted: 2 August 2012 / Published: 8 August 2012
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: Recently the identity of de Bruijn type between the relative entropy and the relative Fisher information with the reference moving has been unveiled by Verdú via MMSE in estimation theory. In this paper, we shall give another proof of this identity in more direct way that the derivative is calculated by applying integrations by part with the heat equation. We shall also derive an integral representation of the relative entropy, as one of the applications of which the logarithmic Sobolev inequality for centered Gaussian measures will be given.
Keywords: relative entropy; relative Fisher information; de Bruijn identity; logarithmic Sobolev inequality; Stam inequality
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MDPI and ACS Style

Hirata, M.; Nemoto, A.; Yoshida, H. An Integral Representation of the Relative Entropy. Entropy 2012, 14, 1469-1477.

AMA Style

Hirata M, Nemoto A, Yoshida H. An Integral Representation of the Relative Entropy. Entropy. 2012; 14(8):1469-1477.

Chicago/Turabian Style

Hirata, Miku; Nemoto, Aya; Yoshida, Hiroaki. 2012. "An Integral Representation of the Relative Entropy." Entropy 14, no. 8: 1469-1477.

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