Recently the identity of de Bruijn type between the relative entropy and the relative Fisher information with the reference moving has been unveiled by Verdu 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.
机构:
Univ Calif Santa Barbara, Dept Stat & Appl Probabil, Santa Barbara, CA 93106 USAUniv Calif Santa Barbara, Dept Stat & Appl Probabil, Santa Barbara, CA 93106 USA
Ahn, H
ANNALS OF PROBABILITY,
1997,
25
(02):
: 997
-
1010
机构:
Univ Catania, Fac Sci, Dipartimento Matemat, Viale Andrea Doria 6, I-95125 Catania, ItalyUniv Catania, Fac Sci, Dipartimento Matemat, Viale Andrea Doria 6, I-95125 Catania, Italy
Cilia, Raffaella
Gutierrez, Joaquin M.
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机构:
Univ Politecn Madrid, ETS Ingn Ind, Dept Matemat Aplicada, C Jose Cutierrez Abascal 2, E-28006 Madrid, SpainUniv Catania, Fac Sci, Dipartimento Matemat, Viale Andrea Doria 6, I-95125 Catania, Italy