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Viewing Version 2 of 'Fatou's lemma'
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Title of object: Fatou's lemma
Canonical Name: FatousLemma
Type: Theorem

Created on: 2002-12-07 10:35:16.106202-05
Modified on: 2002-12-07 11:26:45.53114-05

Creator: Koro
Modifier: Koro
Author: Koro

Classification: msc:28A20

Preamble:

% this is the default PlanetMath preamble. as your knowledge
% of TeX increases, you will probably want to edit this, but
% it should be fine as is for beginners.
% almost certainly you want these
\usepackage{amssymb}
\usepackage{amsmath}
\usepackage{amsfonts}
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%\usepackage{psfrag}
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%\usepackage{graphicx}
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%\usepackage{amsthm}
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Content:

If $f_1, f_2,\dots$ is a sequence of nonnegative measurable functions in a measure space $X$, then
\[ \int_X \liminf_{n\rightarrow\infty} f_n \leq
\liminf_{n\rightarrow\infty}\int_X f_n \]