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Published online by Cambridge University Press: 20 November 2018
The following theorem is a well-known tool in the study of measurable functions:
Theorem. Let (M; μ) be a finite measure space and let (xn) be a sequence of functions in L1(M; μ) so that xn→0 in the norm of L1(M; μ). Then there is a sub-sequence so that xnk →0 pointwise almost everywhere on M.