Let X = R (or any uncountable set). Define µ* : P(X) → R by { if A is countable µ*(A) = 1 if A is uncountable. Then show that µ* is an outer measure but not a measure.

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter9: Systems Of Equations And Inequalities
Section: Chapter Questions
Problem 12T
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(In Real Analysis)

Let X = R (or any uncountable set). Define µ* : P(X) → R by
{
if A is countable
µ*(A) =
1
if A is uncountable.
Then show that µ* is an outer measure but not a measure.
Transcribed Image Text:Let X = R (or any uncountable set). Define µ* : P(X) → R by { if A is countable µ*(A) = 1 if A is uncountable. Then show that µ* is an outer measure but not a measure.
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