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Talagrand's concentration inequality : ウィキペディア英語版
Talagrand's concentration inequality

In probability theory, Talagrand's concentration inequality is an isoperimetric-type inequality for product probability spaces. It was first proved by the French mathematician Michel Talagrand. The inequality is one of the manifestations of the concentration of measure phenomenon.〔
==Statement==
The inequality states that if \Omega = \Omega_1 \times \Omega_2 \times \cdots \times \Omega_n is a product space endowed with a product probability measure and A
is a subset in this space, then for any t \ge 0
: \Pr() \cdot \Pr\left() \le e^ \, ,
where \overline is the complement of ''At'' where this is defined by
:A_t = \
and where \rho is Talagrand's convex distance defined as
: \rho(A,x) = \max_ \ \min_ \ \sum_ \alpha_i
where \alpha \in \mathbf^n, x,y \in \Omega are n-dimensional vectors with entries
\alpha_i, x_i, y_i respectively and \|\cdot\|_2 is the \ell^2-norm. That is,
:\|\alpha\|_2=\left(\sum_i\alpha_i^2\right)^

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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