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Vitali-Hahn-Saks theorem

  

Vitali-Hahn-Saks theorem

In mathematics, the Vitali-Hahn-Saks theorem states that given μn for each integer n >0, a countably additive function defined on a fixed sigma-algebra Σ, with values in a given Banach space B, such that

exists for every set X in Σ, then μ is also countably additive. In other words, the limit of a sequence of spectral measures is a spectral measure.
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