Sigma-algebra: Forskelle mellem versioner

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Linje 10:
# <math>X \in \Sigma</math>
# <math>E \in \Sigma</math> <math> \Rightarrow </math> <math>E^c \in \Sigma</math>
# <math>A_1E_1, A_2E_2, A_3E_3, ... \in \Sigma</math> <math> \Rightarrow </math> <math> \cup_{n=1}^{\infty}A_nE_n \in \Sigma </math>
 
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