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Author: WikiMatrix
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English[en]
A theorem of A. Dvoretzky and C. A. Rogers asserts that every infinite-dimensional Banach space admits an unconditionally convergent series that is not absolutely convergent.
Hungarian[hu]
A. Dvoretzky és C. A. Rogers tétele szerint a végtelen dimenziós Banach-terekben létezik feltételesen konvergens sor.