Random Variables and Measurable Functions.
Chapter 3Random Variables andMeasurable MeasurabilityDefinition 42( Measurable function) Letfbe a function from a measurablespace( ,F)into the real numbers. We say that the function ismeasurableiffor each Borel setB B,theset{ ;f( ) B} 43( Random variable ) Arandom variableXis a Measurable func-tion from a probability space( ,F,P)into the real numbers<.Definition 44(Indicator Random Variables ) For an arbitrary setA FdefineIA( )=1if Aand0otherwise. Thisiscalledanindicator 45(Simple Random Variables ) Consider eventsAi F,i=1,2,3.
3.2. CUMULATIVE DISTRIBUTION FUNCTIONS 17 2. If X is a real-valued random variable then [X = −∞]=ϕthe empty set. Therefore for any sequence x
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