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Tilted large deviation principle : ウィキペディア英語版
Tilted large deviation principle
In mathematics — specifically, in large deviations theory — the tilted large deviation principle is a result that allows one to generate a new large deviation principle from an old one by "tilting", i.e. integration against an exponential functional. It can be seen as an alternative formulation of Varadhan's lemma.
==Statement of the theorem==

Let ''X'' be a Polish space (i.e., a separable, completely metrizable topological space), and let (''μ''''ε'')''ε''>0 be a family of probability measures on ''X'' that satisfies the large deviation principle with rate function ''I'' : ''X'' → (). Let ''F'' : ''X'' → R be a continuous function that is bounded from above. For each Borel set ''S'' ⊆ ''X'', let
:J_ (S) = \int_ e^ \, \mathrm \mu_ (x)
and define a new family of probability measures (''ν''''ε'')''ε''>0 on ''X'' by
:\nu_ (S) = \frac.
Then (''ν''''ε'')''ε''>0 satisfies the large deviation principle on ''X'' with rate function ''I''''F'' : ''X'' → () given by
:I^ (x) = \sup_ \big(F(y) - I(y) \big ) - \big(F(x) - I(x) \big ).

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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