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Contents

   



(Top)
 


1 Values in Banach spaces  





2 Bounded operators  





3 Semigroups  





4 References  














Strongly measurable function







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From Wikipedia, the free encyclopedia
 


Strong measurability has a number of different meanings, some of which are explained below.

Values in Banach spaces[edit]

For a function f with values in a Banach space (orFréchet space), strong measurability usually means Bochner measurability.

However, if the values of f lie in the space ofcontinuous linear operators from XtoY, then often strong measurability means that the operator f(x) is Bochner measurable for each fixed x in the domain of f, whereas the Bochner measurability of f is called uniform measurability (cf. "uniformly continuous" vs. "strongly continuous").

Bounded operators[edit]

A family of bounded linear operators combined with the direct integral is strongly measurable, when each of the individual operators is strongly measurable.

Semigroups[edit]

Asemigroup of linear operators can be strongly measurable yet not strongly continuous.[1] It is uniformly measurable if and only if it is uniformly continuous, i.e., if and only if its generator is bounded.

References[edit]

  1. ^ Example 6.1.10 in Linear Operators and Their Spectra, Cambridge University Press (2007) by E.B.Davies


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