MHB How should I show that lim_n ∫〖f_n dm〗 = ∫〖f dm〗?

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The discussion focuses on proving that if a sequence of functions {f_n} converges almost everywhere to a function f, and if the integrals of the supremum functions F_n remain bounded as n approaches infinity, then the limit of the integrals of f_n equals the integral of f. The key condition is the boundedness of the integrals of F_n, which is crucial for the convergence of the integrals. The proof involves leveraging properties of almost everywhere convergence and the Dominated Convergence Theorem. This establishes a strong link between pointwise convergence of functions and the convergence of their integrals. The conclusion emphasizes the importance of boundedness in ensuring the desired equality of integrals.
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Suppose {f_n} is a sequence of functions that converges almost everywhere to a function f
and define F_n = sup_k=1,...n |f_n| .
Show that if the integrals of F_n remain bounded as n goes to infinity,
then lim_n ∫〖f_n dm〗 = ∫〖f dm〗.
 
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Jack said:
Suppose {f_n} is a sequence of functions that converges almost everywhere to a function f
and define F_n = sup_k=1,...n |f_n| .
Show that if the integrals of F_n remain bounded as n goes to infinity,
then lim_n ∫〖f_n dm〗 = ∫〖f dm〗.

Please do not copy and paste text with non-standard characters, not everybodies system will render them correctly, learn to use the LaTeX supported here on MHB and on most other maths boards.

By default avoid non-ASCII characters.

CB
 
Last edited:

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