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


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==Values in Banach spaces==
For a function ''f'' with values in a [[Banach space]] (or [[Fréchet space]]) ''X'', ''strong measurability'' usually means [[Bochner measurability]].
 
However, if the values of ''f'' lie in the space <math>\mathcal{L}(X,Y)</math> of continuous [[linear functional]]s from ''X'' to ''Y'', then often ''strong measurability'' means that ''fx'' is Bochner measurable for each <math>x\in X</math>, whereas the Bochner measurability of ''f'' is called ''uniform measurability'' (cf. "[[uniformly continuous]]" vs. "[[strongly continuous]]").
 
===Semi-groups===
It is well known that a semigroup of linear operators is always strongly measurable and strongly continuous but it is uniformly measurable if and only if it is uniformly continuous, i.e., if and only if its generator is bounded.
 
[[Category:Banach spaces]]
[[Category:Semigroup theory]]
{{algebra-stub}}

Revision as of 14:08, 7 March 2013

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

Values in Banach spaces

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

However, if the values of f lie in the space of continuous linear functionals from X to Y, then often strong measurability means that fx is Bochner measurable for each , whereas the Bochner measurability of f is called uniform measurability (cf. "uniformly continuous" vs. "strongly continuous").

Semi-groups

It is well known that a semigroup of linear operators is always strongly measurable and strongly continuous but it is uniformly measurable if and only if it is uniformly continuous, i.e., if and only if its generator is bounded. Template:Algebra-stub