Selection principle for pointwise bounded sequences of functions
✍ Scribed by Yu. V. Tret’yachenko; V. V. Chistyakov
- Book ID
- 110149396
- Publisher
- SP MAIK Nauka/Interperiodica
- Year
- 2008
- Tongue
- English
- Weight
- 622 KB
- Volume
- 84
- Category
- Article
- ISSN
- 0001-4346
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📜 SIMILAR VOLUMES
Given a sequence of functions bounded in L 1 0 1 , is it possible to extract a subsequence that is pointwise bounded almost everywhere? The main objective of this note is to present an example showing that this is not possible in general. We will also prove a pair of positive results. We show that i
E. Helly's selection principle states that an infinite bounded family of real functions on the closed inter¨al, which is bounded in ¨ariation, contains a pointwise con¨ergent sequence whose limit is a function of bounded ¨ariation. We extend this theorem to metric space valued mappings of bounded va